DOC: Update contributors count

Author: snowman2

README.md

@@ -6,7 +6,7 @@ Python interface to [PROJ](http://proj.org) (cartographic projections and coordi
 
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+<a href="#contributors"><img alt="All Contributors" src="https://img.shields.io/badge/all_contributors-63-orange.svg?style=flat-square"></a>
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