[Valet 4.0] Drop support for Xcode 9, Xcode 10, Swift 4.0, and Swift 4.2 #190
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Starting to tackle #179 in bits and pieces. This PR is pointed at
develop--4.0
.The commit moves us to Cocoapods 1.8, which enables us to start linting our Podspec using Xcode 11.
The next commit starts linting our Podspec using Xcode 11 in CI.
The next commit drops support for Xcode 9 and 10, by removing Xcode 9 and 10 checks in CI and updating our README. This PR continues to support all currently supported operating systems. However, we do have to drop macOS 10.13 and macOS 10.14 in CI, as Travis CI can't build using Xcode 11 and then run tests on macOS 10.13 and macOS 10.14 – testing on macOS 10.13 requires building with Xcode 9, and testing on macOS 10.14 requires building with Xcode 10.
The next commit drops explicit support for Swift 4.0 and 4.2, consolidating on Swift 5.0. We don't have any changes that break Swift 4.0 or Swift 4.2 yet, but we will.
The next commits get CI running again. This was my first attempt to target older operating systems from a newer Xcode, and there were some bumps 😬.