chore(package): update steal-tools to version 2.2.6

Closes #36

Author: greenkeeper[bot]

package.json

@@ -24,7 +24,7 @@
     "jshint": "^2.9.1",
     "steal": "^2.0.0",
     "steal-qunit": "^2.0.0",
-    "steal-tools": "^1.2.0",
+    "steal-tools": "^2.2.6",
     "testee": "^0.9.0"
   },
   "homepage": "https://github.com/canjs/can-dom-mutate",