feat: update gatsby peer dep version greater than or equal to v3.1.0

fix #135

Author: sbardian

package.json

@@ -81,6 +81,6 @@
     "semantic-release": "17.4.2"
   },
   "peerDependencies": {
-    "gatsby": "3.1.0"
+    "gatsby": ">=3.1.0"
   }
 }