v2.4 doc

README.md

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 # GoQuorum for ibet Network
 
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-  <img alt="Version" src="https://img.shields.io/badge/version-2.3-blue.svg?cacheSeconds=2592000" />
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 This project is [GoQuorum](https://github.com/ConsenSys/quorum) fork for [ibet Network](https://github.com/BoostryJP/ibet-Network)
 
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 ## Version control policy
 
 This project is a fork of GoQuorum (and go-ethereum), and we decide which version of GoQuorum to adopt when developing each version and reflect those modules.