Nuke 7.4

Prefetching Improvements

• Add an ImagePreheater.Destination option to ImagePreheater. The default option is .memoryCache which works exactly the way ImagePreheater used to work before. The more interesting option is .diskCache. The preheater with .diskCache destination will skip image data decoding entirely to reduce CPU and memory usage. It will still load the image data and store it in disk caches so that it can be used later.
• Add a convenience func startPreheating(with urls: [URL]) function which creates requests with .low priority for you.
• ImagePreheater now automatically cancels all of the managed outstanding requests on deinit.
• Add UICollectionViewDataSourcePrefetching demo on iOS 10+. Nuke still supports iOS 9 so Preheat is also still around.

Other Changes

• #187 Fix an issue with progress handler reporting incorrect progress for resumed (206 Partial Content) downloads
• Remove enableExperimentalAggressiveDiskCaching function from ImagePipeline.Configuration, please use DataCache directly instead
• Update Performance Guide