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🎆 Add support for simultaneousUploads (resumable.js) - #27 🙌 Add support for parallelChunkUploads (Dropzone) - #27

Breaking changes

With this release there are some breaking changes for cleaner code. It will break only if you implemented your own handler:

• Any custom handler must implement new method: startSaving which should return ChunkSave or ParallerSave for simultaneousUploads support
• ChunkStorage->files() returns only collection of chunk files, not all files in chunk directory.
• Removed ChunkSave->appendDataToChunkFile method, use FileMerger class
• AbstractHandler::createChunkFileName now has 2 optional parameters.