[google_maps_flutter] Add hint for cloud-based map styling on iOS

[ma-pe]

I added a hint to the readme, that iOS apps need to have a minimum deployment target >= 14.0 to use cloud-based map styling. This is necessary because the feature was introduced with GoogleMaps SDK 8.3.0 which is not available for iOS < 14.0.

Relevant part of GoogleMaps iOS SDK Changelog

There is no Github Issue but a StackOverflow Question that I answered.

Pre-launch Checklist

• I read the Contributor Guide and followed the process outlined there for submitting PRs.
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[stuartmorgan-g]

This is necessary because the feature was introduced with GoogleMaps SDK 8.3.0

According to the official documentation, cloud-based styling is available in 5.x. Is the assertion here that legacy styling does not in fact work in the plugin on iOS 11? If so, please file an issue with detailed steps to reproduce.

• I updated pubspec.yaml with an appropriate new version according to the pub versioning philosophy, or this PR is exempt from version changes.
• I updated CHANGELOG.md to add a description of the change, following repository CHANGELOG style.

In the future, please don't just check all the checkboxes without actually doing the steps. The checklist is there as a guide to complete steps that are required for PRs.

[ma-pe]

In the future, please don't just check all the checkboxes without actually doing the steps. The checklist is there as a guide to complete steps that are required for PRs.

Aye! I'll leave them unchecked next time.

According to the official documentation, cloud-based styling is available in 5.x.

Oh, you are right! I missed that.

Is the assertion here that legacy styling does not in fact work in the plugin on iOS 11? If so, please file an issue with detailed steps to reproduce.

I was expecting this to be the case. Yet when trying to reproduce this in a fresh Flutter app, all worked fine (I double checked, that Google Maps sdk 5.X is used). So it seems to be related to other things going on in my repo.

I will therefore close this PR, sorry and thank you for taking a look! ✌️