Upgrade deprecation-cop

Fixes suggestion to use .editor[mini] to suggest
atom-text-editor

package.json

@@ -80,7 +80,7 @@
     "bookmarks": "0.30.0",
     "bracket-matcher": "0.62.0",
     "command-palette": "0.27.0",
-    "deprecation-cop": "0.12.0",
+    "deprecation-cop": "0.13.0",
     "dev-live-reload": "0.35.0",
     "encoding-selector": "0.7.0",
     "exception-reporting": "0.20.0",