Understand our minimum iOS version and update either `Package.swift` or `README` to reflect it

[lawrence-forooghian]

Our README currently says that our minimum iOS version is 12 and above. Our Package.swift was however updated in https://github.com/ably/ably-asset-tracking-swift/commit/eeb88b0 to require iOS 13 and above. I can't find any explanation for this change.

We've had a few conversations in the past about what our minimum supported version of iOS should be, and we are keen to increase it to iOS 13 if possible. It would be good to find out the customers’ requirements on this.

[sync-by-unito[bot]]

➤ Automation for Jira commented:

The link to the corresponding Jira issue is https://ably.atlassian.net/browse/SDK-3437

[lawrence-forooghian]

If we're going to need to reduce the minimum iOS version back to 12 at some point, then I’ll need to rethink my approach to the network connectivity tests — see https://github.com/ably/ably-asset-tracking-swift/issues/539#issuecomment-1448701972.

[lawrence-forooghian]

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