Update Gemfile dependencies. Fixes dependabot's PR #81

Author: eHooli

Gemfile

@@ -3,4 +3,6 @@ gem 'ffi', '~> 1.13.1'
 gem 'jekyll', '~> 4.2.2'
 gem 'jekyll-sitemap'
 gem 'kramdown', '~> 2.3.1'
+gem "webrick", "~> 1.8"
 gem 'rouge'
+

Gemfile.lock

@@ -1,18 +1,18 @@
 GEM
   remote: https://rubygems.org/
   specs:
-    addressable (2.8.0)
-      public_suffix (>= 2.0.2, < 5.0)
+    addressable (2.8.7)
+      public_suffix (>= 2.0.2, < 7.0)
     colorator (1.1.0)
-    concurrent-ruby (1.1.10)
+    concurrent-ruby (1.3.3)
     em-websocket (0.5.3)
       eventmachine (>= 0.12.9)
       http_parser.rb (~> 0)
     eventmachine (1.2.7)
     ffi (1.13.1)
     forwardable-extended (2.6.0)
     http_parser.rb (0.8.0)
-    i18n (1.12.0)
+    i18n (1.14.5)
       concurrent-ruby (~> 1.0)
     jekyll (4.2.2)
       addressable (~> 2.4)
@@ -39,25 +39,28 @@ GEM
       rexml
     kramdown-parser-gfm (1.1.0)
       kramdown (~> 2.0)
-    liquid (4.0.3)
-    listen (3.7.1)
+    liquid (4.0.4)
+    listen (3.9.0)
       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 (4.0.7)
-    rb-fsevent (0.11.1)
-    rb-inotify (0.10.1)
+    public_suffix (6.0.1)
+    rb-fsevent (0.11.2)
+    rb-inotify (0.11.1)
       ffi (~> 1.0)
-    rexml (3.2.5)
+    rexml (3.3.2)
+      strscan
     rouge (3.30.0)
     safe_yaml (1.0.5)
     sassc (2.4.0)
       ffi (~> 1.9)
+    strscan (3.1.0)
     terminal-table (2.0.0)
       unicode-display_width (~> 1.1, >= 1.1.1)
     unicode-display_width (1.8.0)
+    webrick (1.8.1)
 
 PLATFORMS
   ruby
@@ -68,6 +71,7 @@ DEPENDENCIES
   jekyll-sitemap
   kramdown (~> 2.3.1)
   rouge
+  webrick (~> 1.8)
 
 BUNDLED WITH
-   2.3.7
+   2.4.20