Update CONTRIBUTING guide

CONTRIBUTING.md

@@ -38,21 +38,13 @@ If you want to raise a pull-request with a new feature, or a refactoring
 of existing code, it may well get rejected if you haven't discussed it on
 the [mailing list](https://groups.google.com/forum/#!forum/node-red) first.
 
-### Contributor License Agreement
+All contributors need to sign the JS Foundation's Contributor License Agreement.
+It is an online process and quick to do. You can read the details of the agreement
+here: https://cla.js.foundation/node-red/node-red.
 
-In order for us to accept pull-requests, the contributor must first complete
-a Contributor License Agreement (CLA). This clarifies the intellectual
-property license granted with any contribution. It is for your protection as a
-Contributor as well as the protection of IBM and its customers; it does not
-change your rights to use your own Contributions for any other purpose.
+If you raise a pull-request without having signed the CLA, you will be prompted
+to do so automatically.
 
-You can download the CLAs here:
-
- - [individual](https://nodered.org/cla/node-red-cla-individual.pdf)
- - [corporate](https://nodered.org/cla/node-red-cla-corporate.pdf)
-
-If you are an IBMer, please contact us directly as the contribution process is
-slightly different.
 
 ### Coding standards