chore(deps): update jekyll (#18)

Gemfile

@@ -3,5 +3,5 @@
 source "https://rubygems.org"
 gemspec
 
-gem "jekyll", "3.9.1"
+gem "jekyll", "3.9.2"
 gem "kramdown-parser-gfm", "1.1.0"

Gemfile.lock

@@ -2,25 +2,25 @@ PATH
   remote: .
   specs:
     jekyll-theme-guardian (0.0.1)
-      jekyll (~> 3.9.0)
+      jekyll (~> 3.9.1)
 
 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)
-    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 (1.15.4)
+    ffi (1.15.5)
     forwardable-extended (2.6.0)
-    http_parser.rb (0.6.0)
+    http_parser.rb (0.8.0)
     i18n (0.9.5)
       concurrent-ruby (~> 1.0)
-    jekyll (3.9.1)
+    jekyll (3.9.2)
       addressable (~> 2.4)
       colorator (~> 1.0)
       em-websocket (~> 0.5)
@@ -37,24 +37,24 @@ GEM
       sass (~> 3.4)
     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 (3.7.0)
+    listen (3.7.1)
       rb-fsevent (~> 0.10, >= 0.10.3)
       rb-inotify (~> 0.9, >= 0.9.10)
     mercenary (0.3.6)
     pathutil (0.16.2)
       forwardable-extended (~> 2.6)
-    public_suffix (4.0.6)
+    public_suffix (5.0.0)
     rake (12.3.3)
-    rb-fsevent (0.11.0)
+    rb-fsevent (0.11.2)
     rb-inotify (0.10.1)
       ffi (~> 1.0)
     rexml (3.2.5)
-    rouge (3.26.1)
+    rouge (3.30.0)
     safe_yaml (1.0.5)
     sass (3.7.4)
       sass-listen (~> 4.0.0)
@@ -66,8 +66,8 @@ PLATFORMS
   ruby
 
 DEPENDENCIES
-  bundler (~> 2.2.10)
-  jekyll (= 3.9.1)
+  bundler (~> 2.2.30)
+  jekyll (= 3.9.2)
   jekyll-theme-guardian!
   kramdown-parser-gfm (= 1.1.0)
   rake (~> 12.0)