Add pyflow and pdm

[pawamoy]

• https://github.com/David-OConnor/pyflow
• https://github.com/frostming/pdm

Unless you feel like this would confuse readers! But your page is called "The Big List of Python Packaging and Distribution Tools" so I expect it to be somewhat exhaustive :p

[cs01]

Unless you feel like this would confuse readers! But your page is called "The Big List of Python Packaging and Distribution Tools" so I expect it to be somewhat exhaustive :p

Nope, I agree. Let's add them!

I wanted to strike a balance between making it comprehensive and shipping it. But I also doubt I could find everything out there by myself, so I am grateful for issues like these.