fix(package): update steal to version 2.1.6

Closes #15

Author: greenkeeper[bot]

package.json

@@ -14,7 +14,7 @@
     "http-server": "^0.11.1",
     "react": "^15.4.1",
     "react-dom": "^15.4.1",
-    "steal": "^1.0.10",
+    "steal": "^2.1.6",
     "steal-jsx": "^0.0.2"
   },
   "devDependencies": {