docs(changelog): add contributors for 1.1.7 release (#11115)

Author: Splaktar

CHANGELOG.md

@@ -13,7 +13,13 @@
 
 * **swipe:** allow accessing the original currentTarget ([#10997](https://github.com/angular/material/issues/10997)) ([827990e](https://github.com/angular/material/commit/827990e))
 
+#### Contributors
+
+Thank you to the contributors who helped with the v1.1.7 release:
 
+[<img alt="Splaktar" src="https://avatars1.githubusercontent.com/u/3506071?v=4&s=117" width="117">](https://github.com/Splaktar) |[<img alt="oliversalzburg" src="https://avatars2.githubusercontent.com/u/1658949?v=4&s=117" width="117">](https://github.com/oliversalzburg) |[<img alt="mmalerba" src="https://avatars1.githubusercontent.com/u/14793288?v=4&s=117" width="117">](https://github.com/mmalerba) |[<img alt="cgx" src="https://avatars2.githubusercontent.com/u/1088448?v=4&s=117" width="117">](https://github.com/cgx) |[<img alt="gillyb" src="https://avatars3.githubusercontent.com/u/1319502?v=4&s=117" width="117">](https://github.com/gillyb) |
+:---: |:---: |:---: |:---: |:---: |
+[Splaktar](https://github.com/Splaktar) |[oliversalzburg](https://github.com/oliversalzburg) |[mmalerba](https://github.com/mmalerba) |[cgx](https://github.com/cgx) |[gillyb](https://github.com/gillyb) |
 
 <a name="1.1.6"></a>
 ## [1.1.6](https://github.com/angular/material/compare/v1.1.5...v1.1.6) (2018-01-16)