Colorize gem replaced with rainbow.

lib/tasks/gitlab/check.rake

 # if we ever print anything in red - that's an error
 $check_failed = false
 class String
-  alias_method :orig_red, :red
-  def red(*args)
-    $check_failed = true
-    orig_red(*args)
+  alias_method :orig_color, :color
+  def color(code)
+    if code == :red
+      $check_failed = true
+    end
+    orig_color(code)
   end
 end