Update debug dependency to 2.2.0

[email protected] has a vulnerability in its dependency on [email protected].

[email protected] has updated its ms dependency to a version without this vulnerability.

Author: Joey Cozza

package.json

@@ -275,7 +275,7 @@
   },
   "dependencies": {
     "commander": "2.3.0",
-    "debug": "2.0.0",
+    "debug": "2.2.0",
     "diff": "1.4.0",
     "escape-string-regexp": "1.0.2",
     "glob": "3.2.3",