update readme.md

Author: piomin

readme.md

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 ## Introduction to Blockchain with Java using Ethereum, web3j and Spring Boot  [![Twitter](https://img.shields.io/twitter/follow/piotr_minkowski.svg?style=social&logo=twitter&label=Follow%20Me)](https://twitter.com/piotr_minkowski)
 
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 Detailed description can be found here: [Introduction to Blockchain with Java using Ethereum, web3j and Spring Boot](https://piotrminkowski.com/2018/06/22/introduction-to-blockchain-with-java-using-ethereum-web3j-and-spring-boot/)