Rubocop: Style/SpecialGlobalVars

- Prefer $LOAD_PATH over $:

bin/jekyll

@@ -1,7 +1,7 @@
 #!/usr/bin/env ruby
 STDOUT.sync = true
 
-$:.unshift File.join(File.dirname(__FILE__), *%w{ .. lib })
+$LOAD_PATH.unshift File.join(File.dirname(__FILE__), *%w{ .. lib })
 
 require 'jekyll'
 require 'mercenary'

lib/jekyll.rb

@@ -1,4 +1,4 @@
-$:.unshift File.dirname(__FILE__) # For use/testing when no gem is installed
+$LOAD_PATH.unshift File.dirname(__FILE__) # For use/testing when no gem is installed
 
 # Require all of the Ruby files in the given directory.
 #