comply with linter

Author: iurimatias

lib/versions/npm.js

@@ -1,4 +1,3 @@
-let utils = require('../utils/utils.js');
 let fs = require('../core/fs.js');
 
 let PluginManager = require('live-plugin-manager').PluginManager;
@@ -10,8 +9,6 @@ class Npm {
   }
 
   getPackageVersion(packageName, version, callback) {
-    let self = this;
-    let npmRegistry = "https://registry.npmjs.org/" + packageName + "/" + version;
     let packageDirectory = './.embark/versions/' + packageName + '/' + version + '/';
 
     let manager = new PluginManager({pluginsPath: packageDirectory});