Update release script to remove fixed version

The release script in package.json no longer sets a fixed release version of 3.0.0, allowing release-it to use its default versioning behavior.

Author: mCodex

package.json

@@ -38,7 +38,7 @@
     "lint": "eslint \"**/*.{js,ts,tsx}\"",
     "clean": "del-cli lib",
     "prepare": "bob build",
-    "release": "release-it --only-version --release-version=3.0.0"
+    "release": "release-it --only-version"
   },
   "keywords": [
     "react-native",