Web3j Android 4.5.17 call for review

Web3j- android has a long-awaited PR up that will bring it to feature parity with Web3j 4.5.17.

Check out the PR here https://github.com/web3j/web3j/pull/1188

We are looking forward to releasing this soon so if you have any suggestion now would be a good time to get involved.

This has been succeeded by https://github.com/web3j/web3j/pull/1213 with the aim to target 4.6.0 together with master.