Simplify listening to ready events

package.json

@@ -88,7 +88,7 @@
         "c9.ide.preview": "#3c4dded23f",
         "c9.ide.preview.browser": "#be197b0464",
         "c9.ide.preview.markdown": "#bf952685f6",
-        "c9.ide.pubsub": "#c102844931",
+        "c9.ide.pubsub": "#7dd0a37571",
         "c9.ide.readonly": "#f6f07bbe42",
         "c9.ide.recentfiles": "#7c099abf40",
         "c9.ide.remote": "#37773d905b",