fix(package): update skatejs to version 5.0.0-alpha.11

Closes #334

Author: greenkeeper[bot]

package.json

@@ -35,7 +35,7 @@
     "core-js": "2.4.1",
     "date-fns": "1.28.1",
     "decko": "1.2.0",
-    "skatejs": "4.6.7",
+    "skatejs": "5.0.0-alpha.11",
     "skatejs-web-components": "5.2.1",
     "tslib": "1.6.0"
   },