Add an entry to changelog

Author: dlackty

CHANGELOG.md

@@ -11,6 +11,7 @@
 * Replace Freddy with Swift Codable [#11](https://github.com/polydice/iCook-tvOS/pull/11)
 * Replace Quick and Nimble with XCTest [#12](https://github.com/polydice/iCook-tvOS/pull/12)
 * Swift 5 [#13](https://github.com/polydice/iCook-tvOS/pull/13)
+* Update gems and migrate to GitHub Actions [#14](https://github.com/polydice/iCook-tvOS/pull/14)
 
 ## v1.0.0