Update Development plan

Author: iamWing

README.md

@@ -29,6 +29,7 @@ implemented, please [file an issue], or consider make a [new pull request].
 ### Development plan
 - [ ] Create a `create-react-app`-like package initialiser __!!!__
 - [ ] Integrate another end-to-end testing framework to replace [Spectron]
+- [ ] Migrate to Webpack 5 `Asset Modules`
 
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