Update CONTRIBUTING.md

Koka · Aug 17, 2017 · 570f322 · 570f322
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commit 570f322
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diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md
@@ -11,6 +11,6 @@ Thanks for using this project.
 #### If you have a feature proposal or want to contribute
 
 - Post your proposal on the issue tracker so we can review it together. Some proposals may not be a good fit for the project.
-- Contribute a PR.
+- Contribute a PR (don't forget to write all necessary tests, please).
 - Respond to code review.
 - Watch the PR be merged.