Update location permission reqs for iOS

[rynop]

NSLocationAlwaysUsageDescription deprecated, use NSLocationAlwaysAndWhenInUseUsageDescription.

NSLocationUsageDescription is a macOS key.

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[rynop]

@cla-bot check

[cla-bot]

The cla-bot has been summoned, and re-checked this pull request!

[VladimirAmiorkov]

Because this plugin is being used in iOS version lower than 11.0 we need to make sure that those users know what the appropriate settings are. Can you simply add the new API side by side to the old one and write which one for which version of iOS is usable:

• NSLocationAlwaysAndWhenInUseUsageDescription - iOS +11.0
• NSLocationAlwaysUsageDescription - iOS 8.0–10.0

[Prefix1802]

Can someone please fix this? Would be very much appreciated. :)

[rynop]

@VladimirAmiorkov done. thanks.

[elena-p]

run ci