Renable cops when they are disabled

Rubocop now requires that cops get re-enabled after they are disabled.
This re-enabled previously disabled cops.

Author: natesholland

lib/http/options.rb

@@ -196,3 +196,4 @@ def argument_error!(message)
     end
   end
 end
+# rubocop:enable Metrics/ClassLength

spec/support/dummy_server/servlet.rb

@@ -174,4 +174,5 @@ def do_#{method.upcase}(req, res)
                  end
     end
   end
+  # rubocop:enable Metrics/ClassLength
 end