Changelog.md in argon2-1.1.5 vs Changelog.md in argon2-1.2.0

@@ -1,4 +1,7 @@
+## v1.2.0: 2018-11-29
+- Support for verifying Argon2id format
+
 ## v1.1.5: 2018-04-30
 - Documentation updates
 - Pulled latest reference
 
 ## v1.1.2: 2017-02-25