v0.2.0

• Methods onceOpen and onceClose (with prefix).

v0.1.0

• New methods open and close for fs.ReadStream streams.

v0.0.2

• Listen on end event rather than close.
• Use stream.read() if stream2 is available.
• Use pause/resume to be sure that end event won't be missed if stream1
  is available.
• Do not block on reading of already ended stream.

v0.0.1

• Initial release