Update README contributing guidelines (#565)

App-vNext · Jan 22, 2019 · 0b88966 · 0b88966
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@@ -1018,7 +1018,9 @@ For more detail see: [Polly and interfaces](https://github.com/App-vNext/Polly/w
 
 # Instructions for Contributing
 
-Please check out our [Wiki](https://github.com/App-vNext/Polly/wiki/Git-Workflow) for contributing guidelines. We are following the excellent GitHub Flow process, and would like to make sure you have all of the information needed to be a world-class contributor!
+Please be sure to branch from the head of the latest vX.Y.Z dev branch (rather than master) when developing contributions.  
+
+For github workflow, check out our [Wiki](https://github.com/App-vNext/Polly/wiki/Git-Workflow). We are following the excellent GitHub Flow process, and would like to make sure you have all of the information needed to be a world-class contributor!
 
 Since Polly is part of the .NET Foundation, we ask our contributors to abide by their [Code of Conduct](https://www.dotnetfoundation.org/code-of-conduct).  To contribute (beyond trivial typo corrections), review and sign the [.Net Foundation Contributor License Agreement](https://cla.dotnetfoundation.org/). This ensures the community is free to use your contributions.  The registration process can be completed entirely online.