Update jekyll dependencies

Gemfile.lock

@@ -1,10 +1,10 @@
 GEM
   remote: https://rubygems.org/
   specs:
-    addressable (2.8.0)
-      public_suffix (>= 2.0.2, < 5.0)
+    addressable (2.8.1)
+      public_suffix (>= 2.0.2, < 6.0)
     colorator (1.1.0)
-    concurrent-ruby (1.1.9)
+    concurrent-ruby (1.1.10)
     cssminify2 (2.0.1)
     em-websocket (0.5.3)
       eventmachine (>= 0.12.9)
@@ -15,9 +15,9 @@ GEM
     forwardable-extended (2.6.0)
     htmlcompressor (0.4.0)
     http_parser.rb (0.8.0)
-    i18n (1.8.11)
+    i18n (1.12.0)
       concurrent-ruby (~> 1.0)
-    jekyll (4.2.1)
+    jekyll (4.2.2)
       addressable (~> 2.4)
       colorator (~> 1.0)
       em-websocket (~> 0.5)
@@ -40,32 +40,32 @@ GEM
       uglifier (~> 4.1)
     jekyll-paginate-v2 (3.0.0)
       jekyll (>= 3.0, < 5.0)
-    jekyll-polyglot (1.5.0)
+    jekyll-polyglot (1.5.1)
       jekyll (>= 3.0)
-    jekyll-sass-converter (2.1.0)
+    jekyll-sass-converter (2.2.0)
       sassc (> 2.0.1, < 3.0)
     jekyll-watch (2.2.1)
       listen (~> 3.0)
-    json (2.6.1)
+    json (2.6.2)
     json-minify (0.0.3)
       json (> 0)
-    kramdown (2.3.1)
+    kramdown (2.4.0)
       rexml
     kramdown-parser-gfm (1.1.0)
       kramdown (~> 2.0)
     liquid (4.0.3)
-    listen (3.7.0)
+    listen (3.7.1)
       rb-fsevent (~> 0.10, >= 0.10.3)
       rb-inotify (~> 0.9, >= 0.9.10)
     mercenary (0.4.0)
     pathutil (0.16.2)
       forwardable-extended (~> 2.6)
-    public_suffix (4.0.6)
-    rb-fsevent (0.11.0)
+    public_suffix (5.0.0)
+    rb-fsevent (0.11.2)
     rb-inotify (0.10.1)
       ffi (~> 1.0)
     rexml (3.2.5)
-    rouge (3.27.0)
+    rouge (3.30.0)
     safe_yaml (1.0.5)
     sassc (2.4.0)
       ffi (~> 1.9)