Update Web3 about eth-hot-wallet

[PaulLaux]

I did not try this with the wallet, but I don't think it's going to be a problem to simply update web3.js version.

web3.js requires a provider to work:

const provider = new SignerProvider(rpcAddress, {
        signTransaction: keystore.signTransaction.bind(keystore),
        accounts: (cb) => cb(null, keystore.getAddresses()),
      });

web3.setProvider(provider);

If we update web3, it will still rely on the same eth-lightwallet and ethjs-provider-signer which in turn relay internally on [email protected].

This is not optimal for bundle size but should work without additional changes.
Unfortunately, web3.js tend to lag behind as a dependancy of dependency on many projects.