Update dependencies

[warnes]

bladeRF-mac80211_hwsim requires flex and bison to build successfully. Please add these to the dependency list in the install instructions.

[warnes]

The ifconfig command is also necessary, and can be installed on Ubuntu with:

sudo apt install net-tools 

[warnes]

Further, it is necessary to install flask:

sudo apt install python3-flask

or, of course

pip3 install flask