Ask contributors to go to develop (#677)

* Ask contributors to go to develop

* Enables CI on other branches

.github/workflows/ci.yml

@@ -5,8 +5,7 @@ on:
     branches:
       - develop
   pull_request:
-    branches:
-      - develop
+    types: [opened, synchronize, reopened]
   schedule:
     - cron: 30 1 * * 2 # every Tuesday at 1:30 UTC
 

docs/contributing.md

@@ -1,7 +1,8 @@
 # How to Contribute
 
-We'd love to accept your patches and contributions to this project. There are
-just a few small guidelines you need to follow.
+We'd love to accept your patches and contributions to this project.
+Please base your pull requests on the `develop` branch.
+There are just a few small guidelines you need to follow.
 
 ## Contributor License Agreement