Add gcc and python3-devel to README instructions

[PatPeter]

There are more system packages needed in order to install the requirements.txt, so you should change this:

Install pip: sudo apt-get -y install python3-pip

To this:

Install pip: sudo apt-get -y install python3-pip python3-devel gcc or sudo yum -y install python3-pip python3-devel gcc

[ChillFish8]

This is a OS specific issue, the requirements and setup listed are pretty much universal for any linux based system however, the commands listed by you are required by some but not required by others.