Update dependencies to enable Greenkeeper 🌴 (#3940)

* chore(package): update dependencies

* docs(readme): add Greenkeeper badge

* Fix indent issues with eslint 4.0

see http://eslint.org/docs/user-guide/migrating-to-4.0.0\#-the-indent-rule-is-more-strict

src/cli/utils/commander.js

@@ -38,7 +38,7 @@ Command.prototype.loadDefinitions = function(definitions) {
     return object;
   }, {});
 
-   /* istanbul ignore next */
+  /* istanbul ignore next */
   this.on('--help', function(){
     console.log('  Configure From Environment:');
     console.log('');