v4.0.0

Breaking:

• Make the transform function an async function instead of callback-style (#7) e79bc5e
• Rename the chunkLength option to chunkSize (#7) e79bc5e

Enhancements:

• Add FirstChunkStream.stop which can be returned in the transform function to end the stream early (#7) e79bc5e

v3.0.0...v4.0.0