Add additional required dependencies for pip install to README

[paulvandenburg]

Add additional package install steps to resolve errors on Debian based systems.

I've got 2 errors during installation on Linux Mint.

1. ImportError: No module named setuptools which was fixed by installing the package python-setuptools
2. error: invalid command 'bdist_wheel' which was fixed by install pip package wheel

I've added both steps to the install notes.