macOS 10.11 support?

[kengruven]

Please help prevent duplicate issues before submitting a new one:

• I've searched other open/closed issues for duplicates before opening up this new issue.

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What did you do?

• I built Down.framework for macOS, using Carthage.
• Then I dragged the framework to my Mac application (which is built for 10.11).

What did you expect to happen?

The application would (still) build.

What happened instead?

Xcode refused to build the application, because Down.framework has MACOSX_DEPLOYMENT_TARGET = 10.12.

Down doesn't use any 10.12 APIs, though, so there doesn't appear to be any downside to changing it to MACOSX_DEPLOYMENT_TARGET = 10.11.

An older macOS target isn't out of line with the other supported platforms. Down.framework still claims to support iOS 8, for example, which is roughly the age of macOS 10.10.

[iwasrobbed]

Happy to accept a pull request for this and other tickets (I don't personally use Down with macOS)