chore(package): update steal-tools to version 2.2.4

Closes #75

Author: greenkeeper[bot]

package.json

@@ -38,7 +38,7 @@
     "steal": "^1.0.0",
     "steal-qunit": "^1.0.0",
     "steal-test-helpers": "^0.2.0",
-    "steal-tools": "^1.0.0",
+    "steal-tools": "^2.2.4",
     "test-saucelabs": "0.0.2",
     "testee": "^0.9.1",
     "wd": "^1.2.0"