Allow graphql 15 in peer deps (#64)

Author: Whoaa512

package.json

@@ -35,7 +35,7 @@
     ]
   },
   "peerDependencies": {
-    "graphql": "^0.6.0 || ^0.7.0 || ^0.8.0-b || ^0.9.0 || ^0.10.0 || ^0.11.0 || ^0.12.0 || ^0.13.0 || ^14.0.0",
+    "graphql": "^0.6.0 || ^0.7.0 || ^0.8.0-b || ^0.9.0 || ^0.10.0 || ^0.11.0 || ^0.12.0 || ^0.13.0 || ^14.0.0 || ^15.0.0",
     "react": "^15.6.0 || ^16.0.0",
     "react-dom": "^15.6.0 || ^16.0.0"
   },