Specify package name for dependency installation

This removes any chance of ambiguity and has the potential to speed up
activation a few ms.

Author: Arcanemagus

lib/main.js

@@ -2,9 +2,7 @@
 
 export default {
   activate: () => {
-    // We are now using steelbrain's package dependency package to install our
-    //  dependencies.
-    require('atom-package-deps').install();
+    require('atom-package-deps').install('linter-ruby');
   },
 
   provideLinter: () => {