⬆️ Allow gatsby 4 as peer dependency (#11)

Author: pmontoya

package.json

@@ -34,6 +34,6 @@
     "rimraf": "3.x"
   },
   "peerDependencies": {
-    "gatsby": "^3.0.0 || ^2.0.0"
+    "gatsby": "^4.0.0 || ^3.0.0 || ^2.0.0"
   }
 }