fix(package): update steal to version 2.1.8

Closes #6

Author: greenkeeper[bot]

package.json

@@ -14,7 +14,7 @@
   },
   "dependencies": {
     "jquery": "^3.1.1",
-    "steal": "^1.0.0"
+    "steal": "^2.1.8"
   },
   "system": {
     "npmAlgorithm": "flat",