docs(CHANGELOG): add missing feature to 1.6.0-rc.0

Author: petebacondarwin

CHANGELOG.md

@@ -86,7 +86,7 @@ ensure that Angular 1 can pass the linter checks for Mozilla add-ons.
 
 - **ngModelOptions:** allow options to be inherited from ancestor `ngModelOptions` ([296cfc](https://github.com/angular/angular.js/commit/296cfce40c25e9438bfa46a0eb27240707a10ffa) [#10922](https://github.com/angular/angular.js/issues/10922))
 - **$compile:** set `preAssignBindingsEnabled` to false by default ([bcd0d4](https://github.com/angular/angular.js/commit/bcd0d4d896d0dfdd988ff4f849c1d40366125858) [#15352](https://github.com/angular/angular.js/issues/15352))
-
+- **input[type=number]:** support `step` ([e1da4bed8](https://github.com/angular/angular.js/commit/e1da4bed8e291003d485a8ad346ab80bed8ae2e3) [#10597](https://github.com/angular/angular.js/issues/10597))
 
 ## Bug Fixes