Make prerequisites more clear and add Fedora

[torypages]

I don't know for a fact that libpng-devel.x86_64, freetype-devel.x86_64, and lapack-devel are required, but they did allow me to install the requirements.txt. It's a small pull request, feel free not to accept, no offence will be taken, I just thought I'd share what helped me.

Thanks for the tutorial, looking forward to going through it!