Clean up jest.config.js by removing comments

Removed commented-out ES6 configuration for Jest.

Author: atherdon

jest.config.js

@@ -1,10 +1,3 @@
-// try es6 version later
-// export default {
-//     testEnvironment: 'jest-environment-node',
-//     transform: {}
-//     ...
-// };
-
 const config = {
     verbose: true,
     "moduleNameMapper": {
@@ -25,4 +18,4 @@ const config = {
     },
 };
 
-module.exports = config;
+module.exports = config;