0.6.0

CHANGES:

• h2-async: add Async adapter
  (#94)
• h2-lwt: Close the communication channel after shutting down the client
  (#108)
• h2-lwt-unix: fix premature SSL termination in the SSL / TLS runtimes
  (#109)
• h2-lwt-unix: TLS runtime: adapt to TLS v0.11.0
  (#109)
• h2-lwt-unix: feed EOF to the state machine if the socket has been closed --
  this is especially important on the client because it allows connections to
  terminate cleanly. (#112)
• h2: Refactor the Settings module API
  (#113)
• h2-lwt, h2-lwt-unix: Use gluten to
  implement the Lwt-based runtimes
  (#114)
• h2: set a lower bound on Angstrom 0.14.0
  (#118)
• h2: in the client implementation, don't report an error if the server has
  sent an RST_STREAM frame after sending a complete response
  (#119).
• h2-mirage: Use gluten to implement
  h2-mirage (#120)