Remove colored gem from upgrader script. pt2

Signed-off-by: Dmitriy Zaporozhets <dmitriy.zaporozhets@gmail.com>

lib/gitlab/upgrader.rb

@@ -14,7 +14,7 @@ module Gitlab
         answer = if ARGV.first == "-y"
                    "yes"
                  else
-                   prompt("Do you want to upgrade (yes/no)? ".blue, %w{yes no})
+                   prompt("Do you want to upgrade (yes/no)? ", %w{yes no})
                  end
 
         if answer == "yes"