Update README.md

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diff --git a/README.md b/README.md
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--- a/README.md
+++ b/README.md
@@ -1,6 +1,7 @@
 [![Join the chat at https://gitter.im/gkostka/lwext4](https://badges.gitter.im/gkostka/lwext4.svg)](https://gitter.im/gkostka/lwext4?utm_source=badge&utm_medium=badge&utm_campaign=pr-badge&utm_content=badge)
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+[![](http://img.shields.io/gratipay/user/gkostka.svg)](https://gratipay.com/gkostka/)
 
 ![lwext4](https://cloud.githubusercontent.com/assets/8606098/11697327/68306d88-9eb9-11e5-8807-81a2887f077e.png)