asyncpg v0.17.0

Improvements

Official support for Python 3.7.

Bug Fixes

• Fix garbage collection of connections and emit a ResourceWarning
  if an unclosed connection is garbage collected.
  (by @1st1 in d9a236e for #323)

• Raise a clear error if there's a race in pool intialization.
  (by @1st1 in 3565ef8 for #320)

• Channel names in Connection.add_listener() and
  Connection.remove_listener() are now quoted properly.
  (by @sqwishy in 3e6ade6)

• Fixed endianness detection on *BSD systems.
  (by @elprans in 8c83add for #313)

• Fixed handling of large type OIDs.
  (by @elprans in 2624bdb for #300)