Update README.md (#307)

Author: Olexandr88

README.md

@@ -8,9 +8,7 @@
 Simple command line tool for interacting with web3 enabled blockchains - GoChain, Ethereum, etc.
 This repository also exports the backing golang `package web3`.
 
-[![API Reference](
-https://camo.githubusercontent.com/915b7be44ada53c290eb157634330494ebe3e30a/68747470733a2f2f676f646f632e6f72672f6769746875622e636f6d2f676f6c616e672f6764646f3f7374617475732e737667
-)](https://godoc.org/github.com/gochain/web3)
+[![API Reference](https://pkg.go.dev/badge/github.com/gochain/web3)](https://godoc.org/github.com/gochain/web3)
 ![](https://github.com/gochain/web3/workflows/release/badge.svg)
 
 ```sh