robotoff v1.2.0

Features

• add value_tag in the question formater (#579) (84239f1)
• make neural category apply automatically (#555) (2146f78), closes #552

Bug Fixes

• ensure influxdb database exists (#559) (1f7a9ee)
• scheduler and tasks in isolated transactions - fixes #608 (#609) (c5d44a4)
• set num workers in gunicorn from env (#563) (0290964)
• set num workers in gunicorn from env (#563) (#564) (89c1c13)
• straight conditions for category insights (#570) (1d44643)