Add prometheus dependency to gx

package.json

@@ -50,6 +50,12 @@
       "hash": "QmS4vFMsoH5BwxfWdMBeMt6sBdcBAB5mik1ATADySymLZW",
       "name": "go-libp2p-autonat-svc",
       "version": "1.0.15"
+    },
+    {
+      "author": "whyrusleeping",
+      "hash": "QmaQtvgBNGwD4os5VLWtBLR6HM6TY6ApX6xFqSnfjDF2aW",
+      "name": "client_golang",
+      "version": "0.9.2"
     }
   ],
   "gxVersion": "0.12.1",
@@ -59,3 +65,4 @@
   "releaseCmd": "git commit -a -m \"gx publish $VERSION\"",
   "version": "0.0.19"
 }
+