Add support for ES Module#113

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SaekiRaku wants to merge 5 commits intoacornjs:mainfrom

SaekiRaku:master

Commits on May 31, 2020

Add support for ES Module
SaekiRaku
committed

Commits on Jun 1, 2020

Transoform all codes to ES6 import/export syntax, and generate CommonJS module by rollup.
SaekiRaku
committed

Commits on Jun 2, 2020

Removed all leftover comments, and change var acornJsx to function declaration.
SaekiRaku
committed

Commits on Nov 13, 2020

fix conflict
guoqiqi
committed
add index.cjs.js to the .gitignore
guoqiqi
committed