Remove Support for CentOS from README
Remove Support for CentOS from README

Due to issues with installation on CentOS/RHEL machines, we will only be supporting debian-based OS's for this release. A new issue - Issue #27 - has been created to add support for that OS family.

Relates To: Issue #27

magneticstain/CLTools,magneticstain/CLTools,magneticstain/CLTools,magneticstain/CLTools