Merge pull request angular-ui#3301 from swolfand/master

Fixed a typo in CONTRIBUTING.md

Author: karianna

CONTRIBUTING.md

@@ -23,7 +23,7 @@ A minimal reproduce scenario using http://plnkr.co/ allows us to quickly confirm
 
 We will be insisting on a minimal reproduce scenario in order to save maintainers time and ultimately be able to fix more bugs. Interestingly, from our experience users often find coding problems themselves while preparing a minimal plunk. We understand that sometimes it might be hard to extract essentials bits of code from a larger code-base but we really need to isolate the problem before we can fix it.
 
-The best part is that you don't need to create plunks from scratch - you can for one from our [demo page](http://angular-ui.github.io/bootstrap/).
+The best part is that you don't need to create plunks from scratch - you can use one from our [demo page](http://angular-ui.github.io/bootstrap/).
 
 Unfortunately we are not able to investigate / fix bugs without a minimal reproduce scenario using http://plnkr.co/, so if we don't hear back from you we are going to close an issue that don't have enough info to be reproduced.