Merge pull request prometheus#212 from weaveworks/mention-coc

point out CoC

README.md

@@ -3,7 +3,6 @@
 [![Circle CI](https://circleci.com/gh/weaveworks/common/tree/master.svg?style=shield)](https://circleci.com/gh/weaveworks/common/tree/master)
 [![Go Report Card](https://goreportcard.com/badge/github.com/weaveworks/common)](https://goreportcard.com/report/github.com/weaveworks/common)
 
-
 ## <a name="help"></a>Getting Help
 
 If you have any questions about, feedback for or problems with `common`:
@@ -12,4 +11,6 @@ If you have any questions about, feedback for or problems with `common`:
 - Ask a question on the [#general](https://weave-community.slack.com/messages/general/) slack channel.
 - [File an issue](https://github.com/weaveworks/common/issues/new).
 
+Weaveworks follows the [CNCF Code of Conduct](https://github.com/cncf/foundation/blob/master/code-of-conduct.md). Instances of abusive, harassing, or otherwise unacceptable behavior may be reported by contacting a Weaveworks project maintainer, or Alexis Richardson (alexis@weave.works).
+
 Your feedback is always welcome!