* update read the docs config
* add hints on black code style
* add link to black
* fix path to requirements
* include submodules in build
* add submodule capabilities-data
* format as list
* post on execution on RTD
* use sphinx rtd theme 1.2.0
* add apt dependencies
Python 2.7 EOL is arriving on 2020-01-01: https://pythonclock.org/
This will allow us to use Python 3 only libraries, like python-barcode,
which can maintain a reduced, simpler codebase, due to only one version
to support.
Closes#371.
Signed-off-by: Romain Porte <microjoe@microjoe.org>
Patrick Kanzler