Update to Swift 4.2 and fix Memory Warning

mapbox / mapbox-scenekit

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Update to Swift 4.2 and fix Memory Warning #61

Open hyerra opened 5 years ago

hyerra commented 5 years ago

This PR updates the mapbox-scenekit project to Swift 4.2 and takes care of a warning being raised due to the underlyingQueue being weak. It stores a strong reference to the dispatchQueue being created in order to prevent deallocation.