Bump github-pages from 187 to 188

Bumps [github-pages](https://github.com/github/pages-gem) from 187 to 188.
- [Release notes](https://github.com/github/pages-gem/releases)
- [Commits](github/pages-gem@v187...v188)

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot-support

Gemfile.lock

@@ -30,22 +30,22 @@ GEM
     ffi (1.9.25)
     forwardable-extended (2.6.0)
     gemoji (3.0.0)
-    github-pages (187)
+    github-pages (188)
       activesupport (= 4.2.10)
       github-pages-health-check (= 1.8.1)
       jekyll (= 3.7.3)
-      jekyll-avatar (= 0.5.0)
+      jekyll-avatar (= 0.6.0)
       jekyll-coffeescript (= 1.1.1)
       jekyll-commonmark-ghpages (= 0.1.5)
       jekyll-default-layout (= 0.1.4)
-      jekyll-feed (= 0.9.3)
+      jekyll-feed (= 0.10.0)
       jekyll-gist (= 1.5.0)
       jekyll-github-metadata (= 2.9.4)
-      jekyll-mentions (= 1.3.0)
+      jekyll-mentions (= 1.4.0)
       jekyll-optional-front-matter (= 0.3.0)
       jekyll-paginate (= 1.1.0)
       jekyll-readme-index (= 0.2.0)
-      jekyll-redirect-from (= 0.13.0)
+      jekyll-redirect-from (= 0.14.0)
       jekyll-relative-links (= 0.5.3)
       jekyll-remote-theme (= 0.3.1)
       jekyll-sass-converter (= 1.5.2)
@@ -66,12 +66,12 @@ GEM
       jekyll-theme-tactile (= 0.1.1)
       jekyll-theme-time-machine (= 0.1.1)
       jekyll-titles-from-headings (= 0.5.1)
-      jemoji (= 0.9.0)
+      jemoji (= 0.10.0)
       kramdown (= 1.16.2)
       liquid (= 4.0.0)
       listen (= 3.1.5)
       mercenary (~> 0.3)
-      minima (= 2.4.1)
+      minima (= 2.5.0)
       nokogiri (>= 1.8.2, < 2.0)
       rouge (= 2.2.1)
       terminal-table (~> 1.4)
@@ -109,7 +109,7 @@ GEM
       pathutil (~> 0.9)
       rouge (>= 1.7, < 4)
       safe_yaml (~> 1.0)
-    jekyll-avatar (0.5.0)
+    jekyll-avatar (0.6.0)
       jekyll (~> 3.0)
     jekyll-coffeescript (1.1.1)
       coffee-script (~> 2.2)
@@ -123,23 +123,22 @@ GEM
       rouge (~> 2)
     jekyll-default-layout (0.1.4)
       jekyll (~> 3.0)
-    jekyll-feed (0.9.3)
+    jekyll-feed (0.10.0)
       jekyll (~> 3.3)
     jekyll-gist (1.5.0)
       octokit (~> 4.2)
     jekyll-github-metadata (2.9.4)
       jekyll (~> 3.1)
       octokit (~> 4.0, != 4.4.0)
-    jekyll-mentions (1.3.0)
-      activesupport (~> 4.0)
+    jekyll-mentions (1.4.0)
       html-pipeline (~> 2.3)
       jekyll (~> 3.0)
     jekyll-optional-front-matter (0.3.0)
       jekyll (~> 3.0)
     jekyll-paginate (1.1.0)
     jekyll-readme-index (0.2.0)
       jekyll (~> 3.0)
-    jekyll-redirect-from (0.13.0)
+    jekyll-redirect-from (0.14.0)
       jekyll (~> 3.3)
     jekyll-relative-links (0.5.3)
       jekyll (~> 3.3)
@@ -197,8 +196,7 @@ GEM
       jekyll (~> 3.3)
     jekyll-watch (2.0.0)
       listen (~> 3.0)
-    jemoji (0.9.0)
-      activesupport (~> 4.0, >= 4.2.9)
+    jemoji (0.10.0)
       gemoji (~> 3.0)
       html-pipeline (~> 2.2)
       jekyll (~> 3.0)
@@ -210,13 +208,13 @@ GEM
       ruby_dep (~> 1.2)
     mercenary (0.3.6)
     mini_portile2 (2.3.0)
-    minima (2.4.1)
+    minima (2.5.0)
       jekyll (~> 3.5)
       jekyll-feed (~> 0.9)
       jekyll-seo-tag (~> 2.1)
     minitest (5.11.3)
     multipart-post (2.0.0)
-    nokogiri (1.8.3)
+    nokogiri (1.8.4)
       mini_portile2 (~> 2.3.0)
     octokit (4.9.0)
       sawyer (~> 0.8.0, >= 0.5.3)