Upgrade Ruby to 2.5.1 and Jekyll from 3.0.2 to 3.8.5

Ruby 2.2.2 is end of life. 2.5.1 is used by Debian stable.

This updates all github-pages from 44 to 202,
of which the most import change is its Jekyll dependency.

Slight changes to _config.yml and _includes/meetings.html were needed.

Author: Sjors

.ruby-version

@@ -1 +1 @@
-2.2.2
+2.5.1

.travis.yml

@@ -3,6 +3,10 @@ language: ruby
 ## Save bundler deps.
 cache: bundler
 
+before_install:
+  - gem update --system
+  - gem --version
+
 ## Disable external link checking to prevent spurious failures because
 ## of other people's downtime. This can also avoid wasting their
 ## bandwidth.

Gemfile

@@ -1,9 +1,10 @@
 source 'https://rubygems.org'
 
-## If you update the version here, also update it in .travis.yml and
-## README.md. Then push your branch and make sure Travis supports that
+## This version should match the version in Debian Stable.
+## If you update the version here, also update it in .ruby-version, .travis.yml
+## and README.md. Then push your branch and make sure Travis supports that
 ## version.
-ruby '2.2.2'
+ruby '2.5.1'
 
 ## If you add a new Gem below, run `bundle install` to install it.
 group :development do

Gemfile.lock

@@ -1,135 +1,254 @@
 GEM
   remote: https://rubygems.org/
   specs:
-    RedCloth (4.2.9)
-    activesupport (4.2.5.1)
+    activesupport (4.2.11.1)
       i18n (~> 0.7)
-      json (~> 1.7, >= 1.7.7)
       minitest (~> 5.1)
       thread_safe (~> 0.3, >= 0.3.4)
       tzinfo (~> 1.1)
-    addressable (2.3.8)
+    addressable (2.7.0)
+      public_suffix (>= 2.0.2, < 5.0)
     coffee-script (2.4.1)
       coffee-script-source
       execjs
-    coffee-script-source (1.10.0)
-    colorator (0.1)
-    colored (1.2)
-    ethon (0.8.1)
+    coffee-script-source (1.11.1)
+    colorator (1.1.0)
+    commonmarker (0.17.13)
+      ruby-enum (~> 0.5)
+    concurrent-ruby (1.1.5)
+    dnsruby (1.61.3)
+      addressable (~> 2.5)
+    em-websocket (0.5.1)
+      eventmachine (>= 0.12.9)
+      http_parser.rb (~> 0.6.0)
+    ethon (0.12.0)
       ffi (>= 1.3.0)
-    execjs (2.6.0)
-    faraday (0.9.2)
+    eventmachine (1.2.7)
+    execjs (2.7.0)
+    faraday (0.17.0)
       multipart-post (>= 1.2, < 3)
-    ffi (1.9.10)
-    gemoji (2.1.0)
-    github-pages (44)
-      RedCloth (= 4.2.9)
-      github-pages-health-check (= 0.6.0)
-      jekyll (= 3.0.2)
-      jekyll-coffeescript (= 1.0.1)
-      jekyll-feed (= 0.3.1)
-      jekyll-gist (= 1.4.0)
-      jekyll-mentions (= 1.0.0)
+    ffi (1.11.3)
+    forwardable-extended (2.6.0)
+    gemoji (3.0.1)
+    github-pages (202)
+      activesupport (= 4.2.11.1)
+      github-pages-health-check (= 1.16.1)
+      jekyll (= 3.8.5)
+      jekyll-avatar (= 0.6.0)
+      jekyll-coffeescript (= 1.1.1)
+      jekyll-commonmark-ghpages (= 0.1.6)
+      jekyll-default-layout (= 0.1.4)
+      jekyll-feed (= 0.11.0)
+      jekyll-gist (= 1.5.0)
+      jekyll-github-metadata (= 2.12.1)
+      jekyll-mentions (= 1.4.1)
+      jekyll-optional-front-matter (= 0.3.0)
       jekyll-paginate (= 1.1.0)
-      jekyll-redirect-from (= 0.9.1)
-      jekyll-sass-converter (= 1.3.0)
-      jekyll-seo-tag (= 0.1.4)
-      jekyll-sitemap (= 0.9.0)
-      jekyll-textile-converter (= 0.1.0)
-      jemoji (= 0.5.1)
-      kramdown (= 1.9.0)
-      liquid (= 3.0.6)
+      jekyll-readme-index (= 0.2.0)
+      jekyll-redirect-from (= 0.14.0)
+      jekyll-relative-links (= 0.6.0)
+      jekyll-remote-theme (= 0.4.0)
+      jekyll-sass-converter (= 1.5.2)
+      jekyll-seo-tag (= 2.5.0)
+      jekyll-sitemap (= 1.2.0)
+      jekyll-swiss (= 0.4.0)
+      jekyll-theme-architect (= 0.1.1)
+      jekyll-theme-cayman (= 0.1.1)
+      jekyll-theme-dinky (= 0.1.1)
+      jekyll-theme-hacker (= 0.1.1)
+      jekyll-theme-leap-day (= 0.1.1)
+      jekyll-theme-merlot (= 0.1.1)
+      jekyll-theme-midnight (= 0.1.1)
+      jekyll-theme-minimal (= 0.1.1)
+      jekyll-theme-modernist (= 0.1.1)
+      jekyll-theme-primer (= 0.5.3)
+      jekyll-theme-slate (= 0.1.1)
+      jekyll-theme-tactile (= 0.1.1)
+      jekyll-theme-time-machine (= 0.1.1)
+      jekyll-titles-from-headings (= 0.5.1)
+      jemoji (= 0.10.2)
+      kramdown (= 1.17.0)
+      liquid (= 4.0.0)
+      listen (= 3.1.5)
       mercenary (~> 0.3)
-      rdiscount (= 2.1.8)
-      redcarpet (= 3.3.3)
-      rouge (= 1.10.1)
+      minima (= 2.5.0)
+      nokogiri (>= 1.10.4, < 2.0)
+      rouge (= 3.11.0)
       terminal-table (~> 1.4)
-    github-pages-health-check (0.6.0)
+    github-pages-health-check (1.16.1)
       addressable (~> 2.3)
-      net-dns (~> 0.8)
-      public_suffix (~> 1.4)
-      typhoeus (~> 0.7)
-    html-pipeline (2.3.0)
-      activesupport (>= 2, < 5)
+      dnsruby (~> 1.60)
+      octokit (~> 4.0)
+      public_suffix (~> 3.0)
+      typhoeus (~> 1.3)
+    html-pipeline (2.12.2)
+      activesupport (>= 2)
       nokogiri (>= 1.4)
-    html-proofer (2.6.4)
-      activesupport (~> 4.2)
+    html-proofer (3.14.1)
       addressable (~> 2.3)
-      colored (~> 1.2)
-      mercenary (~> 0.3.2)
-      nokogiri (~> 1.5)
+      mercenary (~> 0.3)
+      nokogiri (~> 1.10)
       parallel (~> 1.3)
-      typhoeus (~> 0.7)
+      rainbow (~> 3.0)
+      typhoeus (~> 1.3)
       yell (~> 2.0)
-    i18n (0.7.0)
-    jekyll (3.0.2)
-      colorator (~> 0.1)
+    http_parser.rb (0.6.0)
+    i18n (0.9.5)
+      concurrent-ruby (~> 1.0)
+    jekyll (3.8.5)
+      addressable (~> 2.4)
+      colorator (~> 1.0)
+      em-websocket (~> 0.5)
+      i18n (~> 0.7)
       jekyll-sass-converter (~> 1.0)
-      jekyll-watch (~> 1.1)
-      kramdown (~> 1.3)
-      liquid (~> 3.0)
+      jekyll-watch (~> 2.0)
+      kramdown (~> 1.14)
+      liquid (~> 4.0)
       mercenary (~> 0.3.3)
-      rouge (~> 1.7)
+      pathutil (~> 0.9)
+      rouge (>= 1.7, < 4)
       safe_yaml (~> 1.0)
-    jekyll-coffeescript (1.0.1)
+    jekyll-avatar (0.6.0)
+      jekyll (~> 3.0)
+    jekyll-coffeescript (1.1.1)
       coffee-script (~> 2.2)
-    jekyll-feed (0.3.1)
-    jekyll-gist (1.4.0)
+      coffee-script-source (~> 1.11.1)
+    jekyll-commonmark (1.3.1)
+      commonmarker (~> 0.14)
+      jekyll (>= 3.7, < 5.0)
+    jekyll-commonmark-ghpages (0.1.6)
+      commonmarker (~> 0.17.6)
+      jekyll-commonmark (~> 1.2)
+      rouge (>= 2.0, < 4.0)
+    jekyll-default-layout (0.1.4)
+      jekyll (~> 3.0)
+    jekyll-feed (0.11.0)
+      jekyll (~> 3.3)
+    jekyll-gist (1.5.0)
       octokit (~> 4.2)
-    jekyll-mentions (1.0.0)
-      html-pipeline (~> 2.2)
+    jekyll-github-metadata (2.12.1)
+      jekyll (~> 3.4)
+      octokit (~> 4.0, != 4.4.0)
+    jekyll-mentions (1.4.1)
+      html-pipeline (~> 2.3)
+      jekyll (~> 3.0)
+    jekyll-optional-front-matter (0.3.0)
       jekyll (~> 3.0)
     jekyll-paginate (1.1.0)
-    jekyll-redirect-from (0.9.1)
-      jekyll (>= 2.0)
-    jekyll-sass-converter (1.3.0)
-      sass (~> 3.2)
-    jekyll-seo-tag (0.1.4)
-      jekyll (>= 2.0)
-    jekyll-sitemap (0.9.0)
-    jekyll-textile-converter (0.1.0)
-      RedCloth (~> 4.0)
-    jekyll-watch (1.3.1)
+    jekyll-readme-index (0.2.0)
+      jekyll (~> 3.0)
+    jekyll-redirect-from (0.14.0)
+      jekyll (~> 3.3)
+    jekyll-relative-links (0.6.0)
+      jekyll (~> 3.3)
+    jekyll-remote-theme (0.4.0)
+      addressable (~> 2.0)
+      jekyll (~> 3.5)
+      rubyzip (>= 1.2.1, < 3.0)
+    jekyll-sass-converter (1.5.2)
+      sass (~> 3.4)
+    jekyll-seo-tag (2.5.0)
+      jekyll (~> 3.3)
+    jekyll-sitemap (1.2.0)
+      jekyll (~> 3.3)
+    jekyll-swiss (0.4.0)
+    jekyll-theme-architect (0.1.1)
+      jekyll (~> 3.5)
+      jekyll-seo-tag (~> 2.0)
+    jekyll-theme-cayman (0.1.1)
+      jekyll (~> 3.5)
+      jekyll-seo-tag (~> 2.0)
+    jekyll-theme-dinky (0.1.1)
+      jekyll (~> 3.5)
+      jekyll-seo-tag (~> 2.0)
+    jekyll-theme-hacker (0.1.1)
+      jekyll (~> 3.5)
+      jekyll-seo-tag (~> 2.0)
+    jekyll-theme-leap-day (0.1.1)
+      jekyll (~> 3.5)
+      jekyll-seo-tag (~> 2.0)
+    jekyll-theme-merlot (0.1.1)
+      jekyll (~> 3.5)
+      jekyll-seo-tag (~> 2.0)
+    jekyll-theme-midnight (0.1.1)
+      jekyll (~> 3.5)
+      jekyll-seo-tag (~> 2.0)
+    jekyll-theme-minimal (0.1.1)
+      jekyll (~> 3.5)
+      jekyll-seo-tag (~> 2.0)
+    jekyll-theme-modernist (0.1.1)
+      jekyll (~> 3.5)
+      jekyll-seo-tag (~> 2.0)
+    jekyll-theme-primer (0.5.3)
+      jekyll (~> 3.5)
+      jekyll-github-metadata (~> 2.9)
+      jekyll-seo-tag (~> 2.0)
+    jekyll-theme-slate (0.1.1)
+      jekyll (~> 3.5)
+      jekyll-seo-tag (~> 2.0)
+    jekyll-theme-tactile (0.1.1)
+      jekyll (~> 3.5)
+      jekyll-seo-tag (~> 2.0)
+    jekyll-theme-time-machine (0.1.1)
+      jekyll (~> 3.5)
+      jekyll-seo-tag (~> 2.0)
+    jekyll-titles-from-headings (0.5.1)
+      jekyll (~> 3.3)
+    jekyll-watch (2.2.1)
       listen (~> 3.0)
-    jemoji (0.5.1)
-      gemoji (~> 2.0)
+    jemoji (0.10.2)
+      gemoji (~> 3.0)
       html-pipeline (~> 2.2)
-      jekyll (>= 2.0)
-    json (1.8.3)
-    kramdown (1.9.0)
-    liquid (3.0.6)
-    listen (3.0.5)
-      rb-fsevent (>= 0.9.3)
-      rb-inotify (>= 0.9)
-    mercenary (0.3.5)
-    mini_portile2 (2.0.0)
-    minitest (5.8.4)
-    multipart-post (2.0.0)
-    net-dns (0.8.0)
-    nokogiri (1.6.7.2)
-      mini_portile2 (~> 2.0.0.rc2)
-    octokit (4.2.0)
-      sawyer (~> 0.6.0, >= 0.5.3)
-    parallel (1.6.1)
-    public_suffix (1.5.3)
-    rb-fsevent (0.9.7)
-    rb-inotify (0.9.5)
-      ffi (>= 0.5.0)
-    rdiscount (2.1.8)
-    redcarpet (3.3.3)
-    rouge (1.10.1)
-    safe_yaml (1.0.4)
-    sass (3.4.21)
-    sawyer (0.6.0)
-      addressable (~> 2.3.5)
-      faraday (~> 0.8, < 0.10)
-    terminal-table (1.5.2)
-    thread_safe (0.3.5)
-    typhoeus (0.8.0)
-      ethon (>= 0.8.0)
-    tzinfo (1.2.2)
+      jekyll (~> 3.0)
+    kramdown (1.17.0)
+    liquid (4.0.0)
+    listen (3.1.5)
+      rb-fsevent (~> 0.9, >= 0.9.4)
+      rb-inotify (~> 0.9, >= 0.9.7)
+      ruby_dep (~> 1.2)
+    mercenary (0.3.6)
+    mini_portile2 (2.4.0)
+    minima (2.5.0)
+      jekyll (~> 3.5)
+      jekyll-feed (~> 0.9)
+      jekyll-seo-tag (~> 2.1)
+    minitest (5.13.0)
+    multipart-post (2.1.1)
+    nokogiri (1.10.5)
+      mini_portile2 (~> 2.4.0)
+    octokit (4.14.0)
+      sawyer (~> 0.8.0, >= 0.5.3)
+    parallel (1.19.1)
+    pathutil (0.16.2)
+      forwardable-extended (~> 2.6)
+    public_suffix (3.1.1)
+    rainbow (3.0.0)
+    rb-fsevent (0.10.3)
+    rb-inotify (0.10.0)
+      ffi (~> 1.0)
+    rouge (3.11.0)
+    ruby-enum (0.7.2)
+      i18n
+    ruby_dep (1.5.0)
+    rubyzip (2.0.0)
+    safe_yaml (1.0.5)
+    sass (3.7.4)
+      sass-listen (~> 4.0.0)
+    sass-listen (4.0.0)
+      rb-fsevent (~> 0.9, >= 0.9.4)
+      rb-inotify (~> 0.9, >= 0.9.7)
+    sawyer (0.8.2)
+      addressable (>= 2.3.5)
+      faraday (> 0.8, < 2.0)
+    terminal-table (1.8.0)
+      unicode-display_width (~> 1.1, >= 1.1.1)
+    thread_safe (0.3.6)
+    typhoeus (1.3.1)
+      ethon (>= 0.9.0)
+    tzinfo (1.2.5)
       thread_safe (~> 0.1)
-    yell (2.0.5)
+    unicode-display_width (1.6.0)
+    yell (2.2.0)
 
 PLATFORMS
   ruby
@@ -139,7 +258,7 @@ DEPENDENCIES
   html-proofer
 
 RUBY VERSION
-   ruby 2.2.2p95
+   ruby 2.5.1p57
 
 BUNDLED WITH
-   1.16.1
+   1.17.3