Update CHANGELOG.md

Author: triniwiz

CHANGELOG.md

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+## [2.2.6](https://github.com/nativescript/firebase/compare/2.2.4...2.2.6) (2022-08-02)
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+### Bug Fixes
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+* export enums as non const ([211741a](https://github.com/nativescript/firebase/commit/211741a7a8d3eb34ab4520b7535ef5e4111bc1da))
+* **messaging:** typings ([c7e024d](https://github.com/nativescript/firebase/commit/c7e024db067c005f40b4c7815159efc3477b94e9))
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 ## [2.2.5](https://github.com/nativescript/firebase/compare/2.2.4...2.2.5) (2022-08-02)