feat!: fix semantic versioning issue and update README.md (#565)

* feat!: fix semantic versioning violation and update requirements

BREAKING CHANGE: Changes in v6.1.1 were breaking and should have been v7.0.0:
- iOS deployment target: 15.0 → 16.0
- GoogleMaps dependency: ~> 9.0 → ~> 10.0
- PR: #546
- Release PR: #547

This commit also updates the README to accurately reflect current requirements.

Fixes #563

* feat!: fix semantic versioning violation and update requirements

Changes in v6.1.1 were breaking and should have been v7.0.0:
- iOS deployment target: 15.0 → 16.0
- GoogleMaps dependency: ~> 9.0 → ~> 10.0
- PR: #546
- Release PR: #547

Fixes #563

Author: iHackSubhodip

README.md

@@ -23,7 +23,7 @@ range of applications using the [Google Maps SDK for iOS][sdk].
 
 ## Requirements
 
-- iOS 15.0+
+- iOS 16.0+
 - Xcode 15.0+
 - [Maps SDK for iOS][sdk] (see [Releases](https://github.com/googlemaps/google-maps-ios-utils/releases) for minimum compatible version)
 - A Google Maps Platform [API key](https://developers.google.com/maps/documentation/ios-sdk/get-api-key) from a project with the **Maps SDK for iOS** enabled.