Update CONTRIBUTING.md

diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md
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@@ -50,7 +50,9 @@ Hugo has become a fully featured static site generator, so any new functionality
 
 If it is of some complexity, the contributor is expected to maintain and support the new feature in the future (answer questions on the forum, fix any bugs etc.).
 
-It is recommended to open up a discussion on the [Hugo Forum](https://discourse.gohugo.io/) to get feedback on your idea before you begin. If you are submitting a complex feature, create a small design proposal on the [Hugo issue tracker](https://github.com/gohugoio/hugo/issues) before you start.
+It is recommended to open up a discussion on the [Hugo Forum](https://discourse.gohugo.io/) to get feedback on your idea before you begin. 
+
+Any non-trivial code change needs to update an open [issue](https://github.com/gohugoio/hugo/issues). A non-trivial code change without an issue reference with one of the labels `bug` or `enhancement` will not be merged.
 
 Note that we do not accept new features that require [CGO](https://github.com/golang/go/wiki/cgo).
 We have one exception to this rule which is LibSASS.