v1.5.1

• Solves a bug introduced in v1.5.0 causing the reconnect process to survive
  if the client is stopped while attempting to reconnect.

• Drops the spawned process used for reconnecting. Instead, the reconnect
  attempts are scheduled using timers.

  The option reconnect_sleep now applies to the time between a
  successful connect and the first reconnect attempt, if the connection is lost
  just after connecting. However, there is no delay before reconnecting
  if the connection has been up for at least reconnect_sleep milliseconds.