feat: add "cleanup" function

Author: aleclarson

src/render.js

@@ -8,6 +8,7 @@ import { queryByAPI } from './helpers/queryByAPI';
 import a11yAPI from './helpers/a11yAPI';
 import debugShallow from './helpers/debugShallow';
 import debugDeep from './helpers/debugDeep';
+import cleanup from './cleanup';
 
 type Options = {
   wrapper?: React.ComponentType<any>,