chore(deps): remove reflect-metadata (angular#3058)

Author: Urigo

public/docs/_examples/heroes-graphql/ts/index.html

@@ -12,7 +12,6 @@
     <script src="node_modules/core-js/client/shim.min.js"></script>
 
     <script src="node_modules/zone.js/dist/zone.js"></script>
-    <script src="node_modules/reflect-metadata/Reflect.js"></script>
     <script src="node_modules/systemjs/dist/system.src.js"></script>
 
     <script src="systemjs.config.js"></script>