Fixed typo in CONTRIBUTING.md (#4210)

CONTRIBUTING.md

@@ -3,7 +3,7 @@
 [Contributions](//github.com/almende/vis/blob/master/misc/how_to_help.md) to the vis.js library are very welcome! [We can't do this alone](//github.com/almende/vis/blob/master/misc/we_need_help.md).
 
 ### Questions
-If you have any *general question* on how to use the vis.js library in your own project please check out [stackoverflow](http://stackoverflow.com/questions/tagged/vis.js) for thinks like that. **This is NOT a JavaScript help forum!**
+If you have any *general question* on how to use the vis.js library in your own project please check out [stackoverflow](http://stackoverflow.com/questions/tagged/vis.js) for things like that. **This is NOT a JavaScript help forum!**
 
 ### Bugs, Problems and Feature-Requests
 If you really want to open a new issue:
@@ -45,4 +45,4 @@ Thank you to all our sponsors! (please ask your company to also support this ope
 <a href="https://opencollective.com/vis/sponsor/6/website" target="_blank"><img src="https://opencollective.com/vis/sponsor/6/avatar.svg"></a>
 <a href="https://opencollective.com/vis/sponsor/7/website" target="_blank"><img src="https://opencollective.com/vis/sponsor/7/avatar.svg"></a>
 <a href="https://opencollective.com/vis/sponsor/8/website" target="_blank"><img src="https://opencollective.com/vis/sponsor/8/avatar.svg"></a>
-<a href="https://opencollective.com/vis/sponsor/9/website" target="_blank"><img src="https://opencollective.com/vis/sponsor/9/avatar.svg"></a>
+<a href="https://opencollective.com/vis/sponsor/9/website" target="_blank"><img src="https://opencollective.com/vis/sponsor/9/avatar.svg"></a>