Added missing String.prototype.normalize shim for phantomjs testing.
Added missing String.prototype.normalize shim for phantomjs testing.

ethers-io/ethers.js,ethers-io/ethers.js,ethers-io/ethers.js,ethers-io/ethers.js,ethers-io/ethers.js,ethers-io/ethers.js,ethers-io/ethers.js