docs(changelog): include changelog for release 2.2.1

Merged from the 2.2.x branch.
socketio · Sep 30, 2020 · ea8804e · ea8804e
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+## [2.2.1](https://github.com/socketio/engine.io-parser/compare/2.2.0...2.2.1) (2020-09-30)
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 ## [4.0.1](https://github.com/socketio/engine.io-parser/compare/4.0.0...4.0.1) (2020-09-10)