bump rails-timeago

Gemfile

@@ -126,7 +126,7 @@ gem 'gon',                     '5.1.2'
 gem 'haml',                    '4.0.5'
 gem 'mobile-fu',               '1.3.1'
 gem 'will_paginate',           '3.0.7'
-gem 'rails-timeago',           '2.4.0'
+gem 'rails-timeago',           '2.11.0'
 
 # Workarounds
 # https://github.com/rubyzip/rubyzip#important-note