update CHANGELOG for v9.0.1 [ci skip]

mochajs · Jun 18, 2021 · 858b182 · 858b182
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+# 9.0.1 / 2021-06-18
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+## :nut_and_bolt: Other
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+- #4657: Browser: add separate bundle for modern browsers (@juergba)
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+We added a separate browser bundle `mocha-es2018.js` in javascript ES2018, as we skipped the transpilation down to ES5. This is an **experimental step towards freezing Mocha's support of IE11**.
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+- #4653: ESM: proper version check in `hasStableEsmImplementation` (@alexander-fenster)
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 # 9.0.0 / 2021-06-07
 
 ## :boom: Breaking Changes