Release v2.0.0

[msimerson]

fixes #4

Added

• docs(README): added pretty good documentation
• transformers: HeaderSkipper & LineTransformer (separated the concerns)
• async Iteration: implemented Symbol.asyncIterator for for await...of.
• pipeline Architecture: pipe() now generates independent PassThrough and Transform chains per call to support natural backpressure and sequential piping.

Changed

• style(exnext): converted MessageStream internal state (#queue, #fd, #bufferMax, etc.) to private class fields.
• style(esnext): replaced write_complete polling with a _write_complete event listener.
• source delegation: pause() and resume() now delegate directly to the active #currentSource.

Fixed

• error propagation: ensure disk I/O errors correctly propagate via this.emit('error')
• race conditions: updated destroy() to close file descriptors before unlinking to prevent EBADF errors.