Update devDependencies and gems.

Gemfile

@@ -1,8 +1,8 @@
 source 'https://rubygems.org'
 
 group :development, :test do
-  gem 'jekyll', '~> 3.8.3'
+  gem 'jekyll', '~> 3.8.4'
   gem 'jekyll-redirect-from', '~> 0.14.0'
   gem 'jekyll-sitemap', '~> 1.2.0'
-  gem 'jekyll-toc', '~> 0.6.0'
+  gem 'jekyll-toc', '~> 0.7.1'
 end

Gemfile.lock

@@ -16,7 +16,7 @@ GEM
     http_parser.rb (0.6.0)
     i18n (0.9.5)
       concurrent-ruby (~> 1.0)
-    jekyll (3.8.3)
+    jekyll (3.8.4)
       addressable (~> 2.4)
       colorator (~> 1.0)
       em-websocket (~> 0.5)
@@ -35,7 +35,7 @@ GEM
       sass (~> 3.4)
     jekyll-sitemap (1.2.0)
       jekyll (~> 3.3)
-    jekyll-toc (0.6.0)
+    jekyll-toc (0.7.1)
       nokogiri (~> 1.7)
     jekyll-watch (2.0.0)
       listen (~> 3.0)
@@ -47,20 +47,20 @@ GEM
       ruby_dep (~> 1.2)
     mercenary (0.3.6)
     mini_portile2 (2.3.0)
-    nokogiri (1.8.4)
+    nokogiri (1.8.5)
       mini_portile2 (~> 2.3.0)
-    nokogiri (1.8.4-x64-mingw32)
+    nokogiri (1.8.5-x64-mingw32)
       mini_portile2 (~> 2.3.0)
     pathutil (0.16.1)
       forwardable-extended (~> 2.6)
     public_suffix (3.0.3)
     rb-fsevent (0.10.3)
     rb-inotify (0.9.10)
       ffi (>= 0.5.0, < 2)
-    rouge (3.2.1)
+    rouge (3.3.0)
     ruby_dep (1.5.0)
     safe_yaml (1.0.4)
-    sass (3.5.7)
+    sass (3.6.0)
       sass-listen (~> 4.0.0)
     sass-listen (4.0.0)
       rb-fsevent (~> 0.9, >= 0.9.4)
@@ -71,10 +71,10 @@ PLATFORMS
   x64-mingw32
 
 DEPENDENCIES
-  jekyll (~> 3.8.3)
+  jekyll (~> 3.8.4)
   jekyll-redirect-from (~> 0.14.0)
   jekyll-sitemap (~> 1.2.0)
-  jekyll-toc (~> 0.6.0)
+  jekyll-toc (~> 0.7.1)
 
 BUNDLED WITH
-   1.16.3
+   1.16.6