chore(deps-dev): upgrading eslint and replacing babel-polyfill with corejs (#221)

Author: erunion

lib/enzyme.js

@@ -2,6 +2,7 @@
 const Adapter = require('enzyme-adapter-react-16');
 const enzyme = require('enzyme');
 
-require('babel-polyfill');
+require('core-js/stable');
+require('regenerator-runtime/runtime');
 
 enzyme.configure({ adapter: new Adapter() });