Update CONTRIBUTING.md

ADD: `@allcontributors` explanation
Segelzwerg · Dec 8, 2019 · e6e39b7 · e6e39b7
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diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md
@@ -28,3 +28,4 @@ Use many small commits during development. Each commit should handle only logica
 ### Pull Requests
 
 Please provide a small description as to what you have done and reference any  existing issues you have resolved.
+Please don't forget to comment PRs with `@all-contributors please add <username> for <contributions>` in order to update the all contributors list.