Modified CONTRIBUTING to reflect current workflow.
Modified CONTRIBUTING to reflect current workflow.

Change-Id: I644fe131def43bb7eea9475ae8043e7fa734a96a
Signed-off-by: Christopher M. Cantalupo <9cf3ecca60a3dd7112ab0e7250bedb8a752e3958@intel.com>

sssylvester/geopm,cmcantalupo/geopm,cmcantalupo/geopm,geopm/geopm,geopm/geopm,geopm/geopm,geopm/geopm,cmcantalupo/geopm,sssylvester/geopm,sssylvester/geopm,cmcantalupo/geopm,sssylvester/geopm,geopm/geopm,cmcantalupo/geopm