Add Node.js 9 as verified (#3255)

Add Node.js 9 as verified so CLI will not print warning that these versions are not verified.

Author: rosen-vladimirov

package.json

@@ -113,6 +113,6 @@
   },
   "license": "Apache-2.0",
   "engines": {
-    "node": ">=6.0.0 <9.0.0"
+    "node": ">=6.0.0 <10.0.0"
   }
 }