updated changes.md

Author: Alain Dumesny

doc/CHANGES.md

@@ -23,8 +23,9 @@ Change log
 
 ## v0.5.1-dev (work in progress)
 
-- undefined x,y position messes up grid ([#1017](https://github.com/gridstack/gridstack.js/issues/1017)).
+- undefined x,y position messes up grid ([#1017](https://github.com/gridstack/gridstack.js/issues/1017))
 - changed code to 2 spaces
+- fix minHeight during `onStartMoving()` ([#999](https://github.com/gridstack/gridstack.js/issues/999))
 
 ## v0.5.1 (2019-11-07)