chore: update plunker short link (#8137)

Author: josephperrott

.github/ISSUE_TEMPLATE.md

@@ -9,7 +9,7 @@
 
 #### What are the steps to reproduce?
 Providing a StackBlitz/Plunker (or similar) is the *best* way to get the team to see your issue. <br/>
-Plunker starter (using on `@master`): https://goo.gl/DlHd6U<br/>
+Plunker starter (using on `@master`): https://goo.gl/uDmqyY<br/>
 StackBlitz starter (using latest `npm` release): https://goo.gl/wwnhMV<br/>
 
 

README.md

@@ -9,7 +9,7 @@ This is the home for the Angular team's Material Design components built for and
 [Documentation, demos, and guides][aio] |
 [Google group](https://groups.google.com/forum/#!forum/angular-material2) |
 [Contributing](https://github.com/angular/material2/blob/master/CONTRIBUTING.md) |
-[Plunker Template](https://goo.gl/DlHd6U) |
+[Plunker Template](https://goo.gl/uDmqyY) |
 [StackBlitz Template](https://goo.gl/wwnhMV)
 
 ### Getting started