Update changelog

Author: p2

CHANGELOG.md

@@ -5,6 +5,11 @@ Version numbering represents the Swift version, plus a running number representi
 You can also refer to commit logs to get details on what was implemented, fixed and improved.
 
 
+### 2.3.0
+
+- Use Swift 2.3
+
+
 ### 2.2.9
 
 - Allow to add custom authentication headers (thanks @SpectralDragon)