build: update dependencies.

Author: vlandham

Gemfile

@@ -1,3 +1,3 @@
 source "http://rubygems.org"
-gem "kramdown", ">= 2.3.1"
-gem "jekyll", ">=4.2.0"
+gem "kramdown", ">= 2.4.0"
+gem "jekyll", ">=4.2.2"

Gemfile.lock

@@ -1,20 +1,20 @@
 GEM
   remote: http://rubygems.org/
   specs:
-    addressable (2.7.0)
+    addressable (2.8.0)
       public_suffix (>= 2.0.2, < 5.0)
     colorator (1.1.0)
-    concurrent-ruby (1.1.8)
-    em-websocket (0.5.2)
+    concurrent-ruby (1.1.10)
+    em-websocket (0.5.3)
       eventmachine (>= 0.12.9)
-      http_parser.rb (~> 0.6.0)
+      http_parser.rb (~> 0)
     eventmachine (1.2.7)
-    ffi (1.15.0)
+    ffi (1.15.5)
     forwardable-extended (2.6.0)
-    http_parser.rb (0.6.0)
-    i18n (1.8.10)
+    http_parser.rb (0.8.0)
+    i18n (1.12.0)
       concurrent-ruby (~> 1.0)
-    jekyll (4.2.0)
+    jekyll (4.2.2)
       addressable (~> 2.4)
       colorator (~> 1.0)
       em-websocket (~> 0.5)
@@ -29,40 +29,40 @@ GEM
       rouge (~> 3.0)
       safe_yaml (~> 1.0)
       terminal-table (~> 2.0)
-    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)
-    kramdown (2.3.1)
+    kramdown (2.4.0)
       rexml
     kramdown-parser-gfm (1.1.0)
       kramdown (~> 2.0)
     liquid (4.0.3)
-    listen (3.5.1)
+    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 (0.10.4)
+    public_suffix (4.0.7)
+    rb-fsevent (0.11.1)
     rb-inotify (0.10.1)
       ffi (~> 1.0)
     rexml (3.2.5)
-    rouge (3.26.0)
+    rouge (3.30.0)
     safe_yaml (1.0.5)
     sassc (2.4.0)
       ffi (~> 1.9)
     terminal-table (2.0.0)
       unicode-display_width (~> 1.1, >= 1.1.1)
-    unicode-display_width (1.7.0)
+    unicode-display_width (1.8.0)
 
 PLATFORMS
   ruby
 
 DEPENDENCIES
-  jekyll (>= 4.2.0)
-  kramdown (>= 2.3.1)
+  jekyll (>= 4.2.2)
+  kramdown (>= 2.4.0)
 
 BUNDLED WITH
    2.1.4