For versions > 1.10.1 pg8000 returns de-serialized JSON objects rather
than a string. SQL parameters are still strings though.

pg8000 uses Versioneer, which means that development versions have
version strings that don't fit into the dotted triple number format.
Released versions will always fit the triple format though.

The pg8000 dialect now supports the setting of the PostgreSQL parameter
client_encoding from create_engine().

- add pg8000 version detection for the "sane multi rowcount" feature

From pg8000-1.9.14 sane_multi_rowcount is supported so this commit
updates the dialect accordingly.