Use node-fetch

lib/login.js

@@ -2,7 +2,7 @@ import { homedir } from 'os';
 import { join as pathJoin } from 'path';
 import readline from 'readline';
 import fs from 'fs-promise';
-import fetch from 'isomorphic-fetch';
+import fetch from 'node-fetch';
 import { stringify as stringifyQuery } from 'querystring';
 
 const stdin = process.openStdin();