Added some file extensions

[hrkw00]

Before submitting a pull request, please make sure the following is done...

1. Fork the repo and create your branch from master.
2. If you've added code that should be tested, do a sanity check on vim8 and neovim
3. If you've changed APIs, update the README and documentation ./doc/prettier.txt

Please use the simple form below as a guideline for describing your pull request.

Thanks for contributing to vim-prettier

---

Summary
Now I can't use prettier on tsx file and jsx file even when I put typescript and javascript. So thats' why I added some file extensions. I'm not sure if it's correct way, so please give a comment if you have any ideas or opinions.
Added .tsx to typescript
Added .jsx to javascript

[...]

Test Plan

[...]