Bump rouge from 3.19.0 to 3.20.0 (#1260)

Bumps [rouge](https://github.com/rouge-ruby/rouge) from 3.19.0 to 3.20.0.
- [Release notes](https://github.com/rouge-ruby/rouge/releases)
- [Changelog](https://github.com/rouge-ruby/rouge/blob/master/CHANGELOG.md)
- [Commits](rouge-ruby/rouge@v3.19.0...v3.20.0)

Signed-off-by: dependabot-preview[bot] <[email protected]>

Co-authored-by: dependabot-preview[bot] <27856297+dependabot-preview[bot]@users.noreply.github.com>

Author: dependabot-preview[bot]

Gemfile

@@ -6,7 +6,7 @@ gem 'middleman', '~>4.3'
 gem 'middleman-syntax', '~> 3.2'
 gem 'middleman-autoprefixer', '~> 2.7'
 gem 'middleman-sprockets', '~> 4.1'
-gem 'rouge', '~> 3.19'
+gem 'rouge', '~> 3.20'
 gem 'redcarpet', '~> 3.5.0'
 gem 'nokogiri', '~> 1.10.8'
 gem 'sass'

Gemfile.lock

@@ -93,7 +93,7 @@ GEM
     rb-inotify (0.10.1)
       ffi (~> 1.0)
     redcarpet (3.5.0)
-    rouge (3.19.0)
+    rouge (3.20.0)
     sass (3.7.4)
       sass-listen (~> 4.0.0)
     sass-listen (4.0.0)
@@ -124,7 +124,7 @@ DEPENDENCIES
   middleman-syntax (~> 3.2)
   nokogiri (~> 1.10.8)
   redcarpet (~> 3.5.0)
-  rouge (~> 3.19)
+  rouge (~> 3.20)
   sass
 
 RUBY VERSION