Update CONTRIBUTING.md

skype -> zoome

CONTRIBUTING.md

@@ -11,7 +11,7 @@ Second, let's say you want to improve something yourself:
 
 We welcome all such contributions. To do this you need to make changes on your local version of Caiman then push this to the repository by making a **Pull Request** (PR). We will walk you through this process in the rest of the document. 
 
-Before you go through the work required to improve something, we recommend that you let us know your plans. E.g., open an issue, or reach out on Gitter. This way, we can avoid duplicated effort (if someone is already working on it), or wasted time (it could turn out the changes might not be feasible right now). We can usually set up a video chat on Google or Skype to talk about a feature proposal if that works for you.
+Before you go through the work required to improve something, we recommend that you let us know your plans. E.g., open an issue, or reach out on Gitter. This way, we can avoid duplicated effort (if someone is already working on it), or wasted time (it could turn out the changes might not be feasible right now). If needed, can usually set up a video chat on Google or Zoom to talk about a feature proposal if that works for you.
 
 ## Background: how do pull requests work?
 In this section we'll give general background on how making a contribution/PR works. If you just want to get started quickly, feel free to skip to the next section.