Add rollup-plugin-html-minifier

[juliendargelos]

Awesome Contribution Checklist:

• [x] I have read, and re-read the Contributing Guidelines
• [x] I have searched to ensure the suggested item doesn't exist on this list
• [x] This PR contains only one item

Please Provide a Link A Repository for Your Addition

https://github.com/juliendargelos/rollup-plugin-html-minifier

Please Describe Your Addition

This plugin minifies html files in rollup bundle with html-minifier.

[shellscape]

Sorry for the delay in reviewing your PR. Thanks for opening it.