v1.2.0

1.2.0 is a major release of Maxwell that introduces master recovery
features; when a slave is promoted to master, Maxwell is now capable of
recovering the position. See the --master_recovery flag for more
details.

It also upgrades the kafka producer library to 0.9. If you're using
maxwell with a kafka 0.8 server, you must now pass the --kafka0.8 flag
to maxwell.