[chore] Bump debug to version 2.6.4 (#67)

Author: darrachequesne

package.json

@@ -12,7 +12,7 @@
     "is-buffer.js"
   ],
   "dependencies": {
-    "debug": "2.3.3",
+    "debug": "~2.6.4",
     "component-emitter": "1.2.1",
     "has-binary2": "1.0.1",
     "isarray": "2.0.1"