Bump redcarpet from 3.4.0 to 3.5.1

Bumps [redcarpet](https://github.com/vmg/redcarpet) from 3.4.0 to 3.5.1.
- [Release notes](https://github.com/vmg/redcarpet/releases)
- [Changelog](https://github.com/vmg/redcarpet/blob/master/CHANGELOG.md)
- [Commits](vmg/redcarpet@v3.4.0...v3.5.1)

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

Author: dependabot[bot]

Gemfile

@@ -8,5 +8,5 @@ gem 'middleman-autoprefixer', '~> 2.7.0'
 gem "middleman-sprockets", "~> 4.1.0"
 gem "middleman-livereload", "~> 3.4.3"
 gem 'rouge', '~> 2.0.5'
-gem 'redcarpet', '~> 3.4.0'
+gem 'redcarpet', '~> 3.5.1'
 gem 'nokogiri', '~> 1.6.8'

Gemfile.lock

@@ -106,7 +106,7 @@ GEM
     rb-fsevent (0.9.8)
     rb-inotify (0.9.8)
       ffi (>= 0.5.0)
-    redcarpet (3.4.0)
+    redcarpet (3.5.1)
     rouge (2.0.7)
     sass (3.4.23)
     servolux (0.12.0)
@@ -131,7 +131,7 @@ DEPENDENCIES
   middleman-sprockets (~> 4.1.0)
   middleman-syntax (~> 3.0.0)
   nokogiri (~> 1.6.8)
-  redcarpet (~> 3.4.0)
+  redcarpet (~> 3.5.1)
   rouge (~> 2.0.5)
 
 RUBY VERSION