remove dead badge

README.md

@@ -12,7 +12,7 @@ Support
 
 **Support** If you like `linux-insides` you can support me with: 
 
-[![Support with bitcoin](https://img.shields.io/badge/donate-bitcoin-green.svg)](https://www.coinbase.com/checkouts/0bfa452a41cf52c0b3f99500b4f31685) [![Support via gitbook](https://img.shields.io/badge/donate-gitbook-green.svg)](https://gumroad.com/l/gitbook_54c9232c1db1670300055523?wanted=true) [![Join the chat at https://gitter.im/0xAX/linux-insides](https://badges.gitter.im/0xAX/linux-insides.svg)](https://gitter.im/0xAX/linux-insides?utm_source=badge&utm_medium=badge&utm_campaign=pr-badge&utm_content=badge)
+[![Support with bitcoin](https://img.shields.io/badge/donate-bitcoin-green.svg)](https://www.coinbase.com/checkouts/0bfa452a41cf52c0b3f99500b4f31685) [![Join the chat at https://gitter.im/0xAX/linux-insides](https://badges.gitter.im/0xAX/linux-insides.svg)](https://gitter.im/0xAX/linux-insides?utm_source=badge&utm_medium=badge&utm_campaign=pr-badge&utm_content=badge)
 
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