Update CHANGELOG.md

Author: Nevazhnovu

CHANGELOG.md

@@ -1,5 +1,5 @@
 # 2.1.5
-* Removed code signing for IOS
+* [DIA-2811](https://sourcepoint.atlassian.net/browse/DIA-2811) DIA-2811 Removed code signing for IOS [#25](https://github.com/SourcePointUSA/unity-sdk/pull/25)
 
 # 2.1.4
 * [DIA-2808](https://sourcepoint.atlassian.net/browse/DIA-2808) DIA-2808 Implemented JSON parsing with Newtonsoft for Android [#20](https://github.com/SourcePointUSA/unity-sdk/pull/20)