chore(package): update steal-tools to version 2.2.3

Closes #55

Author: greenkeeper[bot]

package.json

@@ -23,7 +23,7 @@
     "jshint": "^2.9.1",
     "steal": "^1.3.1",
     "steal-qunit": "^2.0.0",
-    "steal-tools": "^1.2.0",
+    "steal-tools": "^2.2.3",
     "testee": "^0.9.0"
   },
   "homepage": "https://github.com/canjs/can-dom-events",