Updated CHANGELOG to label 6.2.0 release

Author: Reid Main

CHANGELOG.md

@@ -2,7 +2,7 @@
 
 All notable changes to this project will be documented in this file.
 
-## Upcoming Release
+## 6.2.0
 
 - Fixed issue where images without the screen scale in the file name were failing. ([#100](https://github.com/uber/ios-snapshot-test-case/pull/100))
 - Add convenience FBSnapshotVerifyViewController() function for Swift users ([#101](https://github.com/uber/ios-snapshot-test-case/pull/101))