chore: fix typo in CHANGELOG.md (#3829)

Fix typo in CHANGELOG.md

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Co-authored-by: Jon Shier <jon@jonshier.com>

CHANGELOG.md

@@ -938,14 +938,14 @@ Released on 2019-03-27. All issues associated with this milestone can be found u
 
 #### Updated
 
-- Project for compatability with Xcode 10.2.
+- Project for compatibility with Xcode 10.2.
   - Updated by [Jon Shier](https://github.com/jshier) in Pull Request [#2767](https://github.com/Alamofire/Alamofire/pull/2767).
 - MultipartFormData to have a mutable boundary.
   - Updated by [Ondrej Stocek](https://github.com/ondrejstocek) in Pull Request [#2705](https://github.com/Alamofire/Alamofire/pull/2705).
 
 #### Fixed
 
-- Compatability with SPM from Xcode 10.2.
+- Compatibility with SPM from Xcode 10.2.
   - Fixed by [Klaas](https://github.com/klaas) in Pull Request [#2762](https://github.com/Alamofire/Alamofire/pull/2762).
 
 ## [4.8.1](https://github.com/Alamofire/Alamofire/releases/tag/4.8.1)