update README.md for test requirements
update README.md for test requirements

project-ncl/pnc-cli,thauser/pnc-cli,janinko/pnc-cli,thauser/pnc-cli,project-ncl/pnc-cli,project-ncl/pnc-cli,janinko/pnc-cli,thauser/pnc-cli,janinko/pnc-cli