Keep a changelog

Author: Iwan

CHANGELOG.md

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+## Unreleased
+
+* Cleanup gentype attribute printing [fe05e1051aa94b16f6993ddc5ba9651f89e86907](https://github.com/rescript-lang/syntax/commit/fe05e1051aa94b16f6993ddc5ba9651f89e86907)
+* Implement light weight syntax for poly-variants [f84c5760b3f743f65e934195c87fc06bf88bff75](https://github.com/rescript-lang/syntax/commit/f84c5760b3f743f65e934195c87fc06bf88bff75)
+* Fix bug in fast pipe conversion from Reason. [3d5f2daba5418b821c577ba03e2de1afb0dd66de](https://github.com/rescript-lang/syntax/commit/3d5f2daba5418b821c577ba03e2de1afb0dd66de)
+* Improve parsed AST when tilde is missing in arrow expr parameters. [e52a0c89ac39b578a2062ef15fae2be625962e1f](https://github.com/rescript-lang/syntax/commit/e52a0c89ac39b578a2062ef15fae2be625962e1f)
+* Improve parser diagnostics for missing tilde in labeled parameters. [a0d7689d5d2bfc31dc251e966ac33a3001200171](https://github.com/rescript-lang/syntax/commit/a0d7689d5d2bfc31dc251e966ac33a3001200171)
+* Improve printing of uncurried application with a huggable expression in [c8767215186982e171fe9f9101d518150a65f0d7](https://github.com/rescript-lang/syntax/commit/c8767215186982e171fe9f9101d518150a65f0d7)
+* Improve printing of uncurried arrow typexpr outcome printer in [4d953b668cf47358deccb8b730566f24de25b9ee](https://github.com/rescript-lang/syntax/commit/4d953b668cf47358deccb8b730566f24de25b9ee)
+* Remove support for nativeint syntax in [72d9b7034fc28f317672c94994b322bee520acca](https://github.com/rescript-lang/syntax/commit/72d9b7034fc28f317672c94994b322bee520acca)
+* Improve printing of poly variant typexprs with attributes in [bf6561b](https://github.com/rescript-lang/syntax/commit/bf6561bb5d84557b8b6cbbcd40078c39526af4af) 
+
+
+## ReScript 8.4.2 (December 11, 2020)
+
+Released in https://github.com/rescript-lang/syntax/releases/tag/v8.4.2 as part of https://github.com/rescript-lang/rescript-compiler/releases/tag/8.4.2