chore(docs): update opencollective

CONTRIBUTING.md

@@ -1,13 +1,13 @@
 ## Contributing
 
-[Contributions](//github.com/visjs/vis-charts/blob/master/misc/how_to_help.md) to the vis.js library are very welcome! [We can't do this alone](//github.com/visjs/vis-charts/blob/master/misc/we_need_help.md).
+[Contributions](//github.com/visjs/vis-graph3d/blob/master/misc/how_to_help.md) to the vis.js library are very welcome! [We can't do this alone](//github.com/visjs/vis-graph3d/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 things like that. **This is NOT a JavaScript help forum!**
 
 ### Bugs, Problems and Feature-Requests
 If you really want to open a new issue:
-* Please use the [search functionality](//github.com/visjs/vis-charts/issues) to make sure that there is not already an issue concerning the same topic.
+* Please use the [search functionality](//github.com/visjs/vis-graph3d/issues) to make sure that there is not already an issue concerning the same topic.
 * Please make sure to **mention which module** of vis.js (network, timeline, graph3d, ...) your are referring to.
 * Note that development happens on the `develop` git branch. Be sure to submit PRs against this branch.
 * If you think you found a bug please **provide a simple example** (e.g. on [jsbin](jsbin.com)) that demonstrates the problem.