Bump jekyll from 3.7.2 to 3.8.1

Bumps [jekyll](https://github.com/jekyll/jekyll) from 3.7.2 to 3.8.1.
- [Release notes](https://github.com/jekyll/jekyll/releases)
- [Changelog](https://github.com/jekyll/jekyll/blob/master/History.markdown)
- [Commits](jekyll/jekyll@v3.7.2...v3.8.1)

Signed-off-by: dependabot[bot] <support@dependabot.com>

Author: dependabot-support

Gemfile.lock

@@ -8,13 +8,13 @@ GEM
     em-websocket (0.5.1)
       eventmachine (>= 0.12.9)
       http_parser.rb (~> 0.6.0)
-    eventmachine (1.2.5)
-    ffi (1.9.18)
+    eventmachine (1.2.6)
+    ffi (1.9.23)
     forwardable-extended (2.6.0)
     http_parser.rb (0.6.0)
-    i18n (0.9.3)
+    i18n (0.9.5)
       concurrent-ruby (~> 1.0)
-    jekyll (3.7.2)
+    jekyll (3.8.1)
       addressable (~> 2.4)
       colorator (~> 1.0)
       em-websocket (~> 0.5)
@@ -27,7 +27,7 @@ GEM
       pathutil (~> 0.9)
       rouge (>= 1.7, < 4)
       safe_yaml (~> 1.0)
-    jekyll-sass-converter (1.5.1)
+    jekyll-sass-converter (1.5.2)
       sass (~> 3.4)
     jekyll-watch (2.0.0)
       listen (~> 3.0)
@@ -40,15 +40,15 @@ GEM
     mercenary (0.3.6)
     pathutil (0.16.1)
       forwardable-extended (~> 2.6)
-    public_suffix (3.0.1)
+    public_suffix (3.0.2)
     rake (12.3.0)
-    rb-fsevent (0.10.2)
+    rb-fsevent (0.10.3)
     rb-inotify (0.9.10)
       ffi (>= 0.5.0, < 2)
-    rouge (3.1.0)
+    rouge (3.1.1)
     ruby_dep (1.5.0)
     safe_yaml (1.0.4)
-    sass (3.5.5)
+    sass (3.5.6)
       sass-listen (~> 4.0.0)
     sass-listen (4.0.0)
       rb-fsevent (~> 0.9, >= 0.9.4)