Authored by Justin R. Miller

clarify pull request policy

... ... @@ -7,4 +7,4 @@ If you want to contribute code:
1. If it's generally useful to mapping libraries, consider contributing to the upstream project [Alpstein/route-me](http://github.com/alpstein/route-me), from which this project is derived. We regularly contribute the generally useful parts of our SDK to this project.
1. If it's Mapbox-specific, fork and submit a pull request so that we can review, discuss, and possibly integrate your code.
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1. If it's Mapbox-specific, fork and submit a pull request **against the `develop` branch** so that we can review, discuss, and possibly integrate your code.
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... ...