Upgrade Swift language version to 4.2

BradLarson / GPUImage2

GPUImage 2 is a BSD-licensed Swift framework for GPU-accelerated video and image processing.

BSD 3-Clause "New" or "Revised" License

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Open rhx opened 5 years ago

rhx commented 5 years ago

This upgrades the Swift language version to 4.2 (also tested with Swift 5.1 on macOS and Swift 5.0.1 on a Raspberry Pi).