zendesk/maxwell v1.39.1

v1.39.1, "hello from back from Marrakech"

on GitHub

This is a faily major release, including lots of MariaDB support fixes
and a few months worth of patches.

• GTID support for MariaDB
• Improved JSON column handling for MariaDB
• add --pubsub_message_ordering_key, thanks Billy Braga
• add --pubsub_emulator, thanks Billy Braga
• add --ignore_missing_schema for otherwise untenable schema situations.
• handle TABLESPACE related DDL