Update CHANGELOG.md

Author: cbaker6

CHANGELOG.md

@@ -4,6 +4,9 @@
 [Full Changelog](https://github.com/parse-community/Parse-Swift/compare/1.0.2...main)
 * _Contributing to this repo? Add info about your change here to be included in next release_
 
+__New features__
+- Idempotency support ([#62](https://github.com/parse-community/Parse-Swift/pull/62)), thanks to [Corey Baker](https://github.com/cbaker6).
+
 ### 1.0.2
 [Full Changelog](https://github.com/parse-community/Parse-Swift/compare/1.0.0...1.0.2)