rigplane 3.1.3

RigPlane Core 3.1.3 is a safety fix on top of 3.1.2. It is the code of release
candidate 3.1.3rc1 with the final version number.

python -m pip install --upgrade rigplane==3.1.3

Transmit safety

• A transmitter left keyed after a crash is now released when Core starts or
  reconnects. Before the radio is offered to clients, Core reads the radio's
  PTT; if the radio is transmitting and no one in this Core owns the
  transmission, Core releases it and logs managed_tx.startup_unkey. A failed
  or unverified read changes nothing. (#4474)

Full list: CHANGELOG.