refactor: remove mocking console.warn

Author: Kamil Kisiela

tests/index-spec.js

@@ -4,6 +4,3 @@ import './helpers';
 import './runs';
 import './types';
 import './wrappers';
-
-// mock console warn (we don't need no education - from formly ;] )
-console.warn = function consoleWarn() {};