Add Gitter badge to README [ci skip]

Add mailing list badge.

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 [![Travis Status](https://travis-ci.com/OSGeo/proj.4.svg?branch=master)](https://travis-ci.com/OSGeo/proj.4)
 [![AppVeyor Status](https://ci.appveyor.com/api/projects/status/584j49uguwoo5evi?svg=true)](https://ci.appveyor.com/project/OSGeo/proj-4)
 [![Coveralls Status](https://coveralls.io/repos/github/OSGeo/proj.4/badge.svg?branch=master)](https://coveralls.io/github/OSGeo/proj.4?branch=master)
+[![Gitter](https://badges.gitter.im/OSGeo/proj.4.svg)](https://gitter.im/OSGeo/proj.4)
+[![Mailing List](https://img.shields.io/badge/proj.4-mailing%20list-4eb899.svg)](http://lists.maptools.org/mailman/listinfo/proj)
 
 PROJ is a generic coordinate transformation software, that transforms
 coordinates from one coordinate reference system (CRS) to another.