chore(package): update steal to version 1.5.4

Closes #18

Author: greenkeeper[bot]

package.json

@@ -23,7 +23,7 @@
   "devDependencies": {
     "funcunit": "^3.0.0",
     "jquery": "^3.1.1",
-    "steal": "^0.16.43",
+    "steal": "^1.5.4",
     "steal-qunit": "0.1.4",
     "steal-tools": "^0.16.8",
     "testee": "^0.4.0",