`pip install yaml` doesn't work, use `pip install pyyaml` instead

[ggballas]

In the readme it says packages should be installed:

pip install yaml ecdsa pysha3 web3 cairo-lang

Replace with:

pip install pyyaml ecdsa pysha3 web3 cairo-lang

[amanusk]

yep, thats correct. I would also advise to use virtualenv and not install globally. please make a pr to fix this if you have a moment

[ggballas]

yep, working on all that now, will do 👍