Update doc dependencies

Author: curry684

docs/Gemfile.lock

@@ -1,43 +1,43 @@
 GEM
   remote: https://rubygems.org/
   specs:
-    activesupport (5.0.6)
+    activesupport (5.0.7)
       concurrent-ruby (~> 1.0, >= 1.0.2)
-      i18n (~> 0.7)
+      i18n (>= 0.7, < 2)
       minitest (~> 5.1)
       tzinfo (~> 1.1)
     addressable (2.5.2)
       public_suffix (>= 2.0.2, < 4.0)
     autoprefixer-rails (6.7.7.2)
       execjs
-    backports (3.11.1)
+    backports (3.11.4)
     coffee-script (2.4.1)
       coffee-script-source
       execjs
     coffee-script-source (1.12.2)
     compass-import-once (1.0.5)
       sass (>= 3.2, < 3.5)
-    concurrent-ruby (1.0.5)
+    concurrent-ruby (1.1.3)
     contracts (0.13.0)
-    dotenv (2.2.1)
+    dotenv (2.5.0)
     em-websocket (0.5.1)
       eventmachine (>= 0.12.9)
       http_parser.rb (~> 0.6.0)
     erubis (2.7.0)
-    eventmachine (1.2.5)
+    eventmachine (1.2.7)
     execjs (2.7.0)
     fast_blank (1.0.0)
-    fastimage (2.1.1)
-    ffi (1.9.23)
+    fastimage (2.1.4)
+    ffi (1.9.25)
     haml (5.0.4)
       temple (>= 0.8.0)
       tilt
     hamster (3.0.0)
       concurrent-ruby (~> 1.0)
-    hashie (3.5.7)
+    hashie (3.6.0)
     http_parser.rb (0.6.0)
     i18n (0.7.0)
-    kramdown (1.16.2)
+    kramdown (1.17.0)
     listen (3.0.8)
       rb-fsevent (~> 0.9, >= 0.9.4)
       rb-inotify (~> 0.9, >= 0.9.7)
@@ -90,7 +90,7 @@ GEM
       rouge (~> 2.0)
     mini_portile2 (2.3.0)
     minitest (5.11.3)
-    nokogiri (1.8.2)
+    nokogiri (1.8.5)
       mini_portile2 (~> 2.3.0)
     padrino-helpers (0.13.3.4)
       i18n (~> 0.6, >= 0.6.7)
@@ -99,9 +99,9 @@ GEM
     padrino-support (0.13.3.4)
       activesupport (>= 3.1)
     parallel (1.12.1)
-    public_suffix (3.0.2)
-    rack (2.0.4)
-    rack-livereload (0.3.16)
+    public_suffix (3.0.3)
+    rack (2.0.6)
+    rack-livereload (0.3.17)
       rack
     rb-fsevent (0.10.3)
     rb-inotify (0.9.10)
@@ -110,11 +110,11 @@ GEM
     rouge (2.0.7)
     sass (3.4.25)
     servolux (0.13.0)
-    sprockets (3.7.1)
+    sprockets (3.7.2)
       concurrent-ruby (~> 1.0)
       rack (> 1, < 3)
     temple (0.8.0)
-    thor (0.20.0)
+    thor (0.20.3)
     thread_safe (0.3.6)
     tilt (2.0.8)
     tzinfo (1.2.5)
@@ -139,4 +139,4 @@ RUBY VERSION
    ruby 2.3.3p222
 
 BUNDLED WITH
-   1.16.0
+   1.16.1