v0.1.8

- Fix promise reject issue (#936)
- Add --types command line flag.
- Add metrics()
- Add redirect follow feature #934
- Fix clearTimer bug #942
- Improve error printing #935
- Expose I/O interfaces Closer, Seeker, ReaderCloser, WriteCloser,
  ReadSeeker, WriteSeeker, ReadWriteCloser, ReadWriteSeeker
- Fix silent death on double await #919
- Add Conn.closeRead() and Conn.closeWrite() #903