v1.10.4

Notable changes:

• Shutdown hardening. If maxwell can't shut down (because the kafka
  producer is in a bad state and close() never terminates, for example),
  it would previously stall and process no messages. Now, shutdown is run
  in a separate thread and there is an additional watchdog thread which
  forcibly kills the maxwell process if it can't shut down within 10
  seconds.
• Initial support for running maxwell from java, rather then as its own
  process. This mode of operation is still experimental, but we'll
  accept PRs to improve it (thanks Geoff Lywood).
• Fix incorrect handling of negative (pre-epoch dates) when using
  binlog_connector mode (thanks Geoff Lywood).