chore(package): update reflect-metadata to version 0.1.8

https://greenkeeper.io/

Author: greenkeeperio-bot

package.json

@@ -78,7 +78,7 @@
     "es6-promise": "^3.0.2",
     "es6-shim": "^0.35.0",
     "zone.js": "^0.6.12",
-    "reflect-metadata": "0.1.2",
+    "reflect-metadata": "0.1.8",
     "rimraf": "^2.5.2",
     "systemjs": "0.19.31",
     "tslint": "^3.8.1",