README.md in oj-3.3.8 vs README.md in oj-3.3.9

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 # [![{}j](http://www.ohler.com/dev/images/oj_comet_64.svg)](http://www.ohler.com/oj) gem
 
-[![Build Status](https://img.shields.io/travis/ohler55/oj/master.svg)](http://travis-ci.org/ohler55/oj?branch=master) [![AppVeyor](https://img.shields.io/appveyor/ci/ohler55/oj/master.svg)](https://ci.appveyor.com/project/ohler55/oj) ![Gem](https://img.shields.io/gem/v/oj.svg) ![Gem](https://img.shields.io/gem/dt/oj.svg)
+[![Build Status](https://img.shields.io/travis/ohler55/oj/master.svg)](http://travis-ci.org/ohler55/oj?branch=master) [![AppVeyor](https://img.shields.io/appveyor/ci/ohler55/oj/master.svg)](https://ci.appveyor.com/project/ohler55/oj) ![Gem](https://img.shields.io/gem/v/oj.svg) ![Gem](https://img.shields.io/gem/dt/oj.svg) [![Gratipay](https://img.shields.io/gratipay/project/oj.svg)](https://gratipay.com/oj/)
 
 A *fast* JSON parser and Object marshaller as a Ruby gem.
 
 Version 3.0 is out! 3.0 provides better json gem and Rails compatibility. It
 also provides additional optimization options.