Update CHANGELOG.md

Adds Revert Note to release 3.0.7

Author: JLLeitschuh

CHANGELOG.md

@@ -4,7 +4,7 @@
 
 #### Bug Fixes
 
-* **Header:** Use IE9 condcom to fix header sizing ([a549eaa7](http://github.com/angular-ui/ng-grid/commit/a549eaa76c4a0fcb9cfd48f62cb4081b7734caf8), closes [#3854](http://github.com/angular-ui/ng-grid/issues/3854))
+* **Header:** Use IE9 condcom to fix header sizing ([a549eaa7](http://github.com/angular-ui/ng-grid/commit/a549eaa76c4a0fcb9cfd48f62cb4081b7734caf8), closes [#3854](http://github.com/angular-ui/ng-grid/issues/3854)) <b>(REVERTED [#4417](https://github.com/angular-ui/ui-grid/pull/4417))</B>
 * **core:**
   * Fixes sort priority starting at 2 ([c910a6a3](http://github.com/angular-ui/ng-grid/commit/c910a6a318fd6ae832e3265a9220c43431f7e97c))
   * scrollTo rightBound calculation ([28227877](http://github.com/angular-ui/ng-grid/commit/2822787719f230808898b940f04bc7d63c0869f5))