Bump bourbon from 4.3.4 to 6.0.0

Bumps [bourbon](https://github.com/thoughtbot/bourbon) from 4.3.4 to 6.0.0.
- [Release notes](https://github.com/thoughtbot/bourbon/releases)
- [Changelog](https://github.com/thoughtbot/bourbon/blob/master/CHANGELOG.md)
- [Commits](thoughtbot/bourbon@v4.3.4...v6.0.0)

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

Author: dependabot-preview[bot]

Gemfile

@@ -29,7 +29,7 @@ gem 'font-awesome-sass'
 
 # Neat bourbon RWD Framework
 gem 'neat', '~> 1.8'
-gem 'bourbon', '~> 4.2'
+gem 'bourbon', '~> 6.0'
 gem 'bitters'
 
 # Use jquery as the JavaScript library

Gemfile.lock

@@ -119,8 +119,7 @@ GEM
       bourbon (>= 4.2)
       sass (>= 3.4)
       thor
-    bourbon (4.3.4)
-      sass (~> 3.4)
+    bourbon (6.0.0)
       thor (~> 0.19)
     builder (3.2.3)
     byebug (11.0.1)
@@ -465,7 +464,7 @@ DEPENDENCIES
   actionpack-page_caching
   active_link_to
   bitters
-  bourbon (~> 4.2)
+  bourbon (~> 6.0)
   byebug
   coderay
   coffee-rails (~> 4.1.0)