README.md suggests to use `sudo pip`

[WolframKahl]

sudo pip ... is strongly discouraged, see:

https://askubuntu.com/questions/802544/is-sudo-pip-install-still-a-broken-practice/802594#802594

(Also, neither pip nor easy_install should be assumed present, IMHO.)

[agurfinkel]

Right, the instructions are a bit outdated. They are mostly there for us to remember what packages are required. We would gladly accept a PR to fix this.