Remove ruby18_source_location gem

Gemfile

@@ -10,8 +10,3 @@ gem 'redcarpet', '~> 3.2.1'
 
 gem 'rake', '~> 10.4.0'
 gem 'therubyracer', platforms: :ruby
-
-# Trash
-platforms :mri_18 do
-  gem 'ruby18_source_location'
-end

Gemfile.lock

@@ -105,7 +105,6 @@ GEM
     redcarpet (3.2.2)
     ref (1.0.5)
     rouge (1.8.0)
-    ruby18_source_location (0.2)
     sass (3.4.12)
     sprockets (2.12.3)
       hike (~> 1.2)
@@ -142,6 +141,5 @@ DEPENDENCIES
   middleman-syntax
   rake (~> 10.4.0)
   redcarpet (~> 3.2.1)
-  rouge (~> 1.8.0)
-  ruby18_source_location
+  rouge (= 1.8.0)
   therubyracer