Rename sneakers.rb to sneakers.rake

lib/capistrano/sneakers.rb

@@ -5,7 +5,7 @@ if cap_version >= Gem::Version.new('3.0.0')
   #
   # Load Tasks from sneakers "cap" file
   #
-  load File.expand_path('../tasks/sneakers.rb', __FILE__)
+  load File.expand_path('../tasks/sneakers.rake', __FILE__)
 else
   raise Gem::LoadError, "Capistrano-Sneakers requires capistrano version 3.0.0 or greater, version detected: #{cap_version}"
 end