docs: badges badges badges badges (#80)

* docs: add gitter badge

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* Update README.md

* Update README.md

* Update README.md

README.md

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 # Geth Classic 
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+[![GitHub release](https://img.shields.io/github/release-pre/eth-classic/go-ethereum.svg)](https://github.com/eth-classic/go-ethereum/releases/latest)
+![GitHub All Releases](https://img.shields.io/github/downloads/eth-classic/go-ethereum/total.svg)
+![LICENSE](https://img.shields.io/github/license/eth-classic/go-ethereum.svg)
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 Official Go-language implementation of the Ethereum Classic protocol. Ethereum Classic (ETC) offers a censorship-resistant and powerful application platform for developers in parallel to the Ethereum Foundation network (ETH), while differentially rejecting the DAO transition.
 
 ## Install Geth Classic