asyncpg v0.18.0

Improvements

• Implement Record.get()
  (by @elprans in 2b93ee5 for #330)

• Internal asyncpg errors are now consistently raised as
  InternalClientError (by @elprans in 263de3f)

• Allow mappings as composite type input
  (by @elprans in eaa2fa1 for #349)

• Add BitString.to_int() and BitString.from_int()
  (by @percontation in ffd134e)

• Allow 'sslmode' in DSNs
  (by @percontation in 0304288)

• Add support for specifying multiple host addresses when connecting
  (by @elprans in 1d650ed for #257)

• Low-level protocol implementation has been tweaked and
  optimized for slightly better performance in certain scenarios
  (by @elprans in 7a81613 and cc053fe)

• Queries with cached statements now generate fewer TCP packets
  (by @aleksey-mashanov in bf07199)

• Allow aliasing builtin types by name in set_builtin_type_codec()
  (by @elprans in 687127e)

• Factor out generic PostgreSQL protocol helpers into a separate package
  (by @1st1 in f0adefc)

• Fix tests and enable CI for PostgreSQL 11
  (by @elprans in ddb0ec2 and 716fd9d)

Bug Fixes

• Handle and ignore permission errors when attempting to read .pgpass
  (by @elprans in df7830f for #356)

• Fix decoding of fractional timestamps before Postgres epoch
  (by @elprans in a7eaf2b for #363)