Added changelog entry for fixing syntax on hf_young

CHANGELOG.md

@@ -3,6 +3,7 @@ All notable changes to this project will be documented in this file.
 This project uses the changelog in accordance with [keepchangelog](http://keepachangelog.com/). Please use this to write notable changes, which is not the same as git commit log...
 
 ## [unreleased][unreleased]
+- Fixed 'hf_young.c' - flags declaration was missing a semicolon (@jakkpotts)
 - Changed `hf mf sim` - add option to allow key b to be used even if readable (@doegox)
 - Changed `data num` - outputed binary strings are now properly zero padded (@iceman1001)
 - Changed `hf iclass info` - now tries default keys and decode if legacy (@iceman1001)