fix(package): update @robotlegsjs/core to version 0.0.4

Author: greenkeeper[bot]

package.json

@@ -35,7 +35,7 @@
   },
   "homepage": "https://github.com/RobotlegsJS/RobotlegsJS-SignalCommandMap#readme",
   "dependencies": {
-    "@robotlegsjs/core": "^0.0.3",
+    "@robotlegsjs/core": "^0.0.4",
     "@robotlegsjs/signals": "^0.0.7"
   },
   "devDependencies": {