use web3.eth.personal.sign instead of web3.eth.sign in Web3Signer

[dotrungkien]

is there any way to use web3.eth.personal.sign instead of web3.eth.sign in Web3Signer

what i want is to use addIdentityMappingAsync with a custom sign message instead of a hash with warning like now.

[redben]

For reference. https://github.com/loomnetwork/loom-js/issues/278