Add v7.12.2 to CHANGELOG.md [skip ci]

CHANGELOG.md

@@ -19,6 +19,11 @@ See [`eslint-plugin-babel`'s releases](https://github.com/babel/eslint-plugin-ba
 
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+## v7.12.2 (2020-10-16)
+
+#### :leftwards_arrow_with_hook: Revert
+* `babel-parser`
+  * [#12198](https://github.com/babel/babel/pull/12198) Revert "Reland "Fix: check if param is assignable when parsing arrow return type annotation"" ([@nicolo-ribaudo](https://github.com/nicolo-ribaudo))
 ## v7.12.1 (2020-10-16)
 
 #### :bug: Bug Fix