Merge pull request #61 from GBH/patch-2

Gratipay is no longer a thing

README.md

@@ -4,7 +4,6 @@ provided by freedesktop.org (see http://freedesktop.org/wiki/Software/shared-mim
 [![Gem Version](https://img.shields.io/gem/v/mimemagic.svg)](http://rubygems.org/gems/mimemagic)
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 Usage