Update version in pubspec.yaml to 3.1.0

Author: mvanbeusekom

geocoding_ios/pubspec.yaml

@@ -1,6 +1,6 @@
 name: geocoding_ios
 description: A Flutter Geocoding plugin which provides easy geocoding and reverse-geocoding features.
-version: 3.0.2
+version: 3.1.0
 repository: https://github.com/baseflow/flutter-geocoding/tree/main/geocoding_ios
 issue_tracker: https://github.com/Baseflow/flutter-geocoding/issues