Update README.md

Author: 0xAX

README.md

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 linux-insides
 ===============
 
-[![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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 A book-in-progress about the linux kernel and its insides.
 
 **The goal is simple** - to share my modest knowledge about the insides of the linux kernel and help people who are interested in linux kernel insides, and other low-level subject matter.
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 **Support** If you like `linux-insides` you can support me with: 
 
-[![Flattr linux-insides](https://img.shields.io/badge/donate-flattr-green.svg)](https://flattr.com/submit/auto?user_id=0xAX&url=https://github.com/0xAX/linux-insides/&title=linux-insed) [![Support at gratipay](https://img.shields.io/gratipay/0xAX.svg)](https://gratipay.com/~0xAX/) [![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)
+[![Flattr linux-insides](https://img.shields.io/badge/donate-flattr-green.svg)](https://flattr.com/submit/auto?user_id=0xAX&url=https://github.com/0xAX/linux-insides/&title=linux-insed) [![Support at gratipay](https://img.shields.io/gratipay/0xAX.svg)](https://gratipay.com/~0xAX/) [![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)
 
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