Change create-subscription's peerDep on react to ^16.3.0 (#12496)

Author: NMinhNguyen

packages/create-subscription/package.json

@@ -13,7 +13,7 @@
     "fbjs": "^0.8.16"
   },
   "peerDependencies": {
-    "react": "^16.3.0-alpha.1"
+    "react": "^16.3.0"
   },
   "devDependencies": {
     "rxjs": "^5.5.6"