Still problems with Travis CI with node 8; deactivating for now.
Still problems with Travis CI with node 8; deactivating for now.

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