Add Diana Guttman to the AUTHORS file.
Add Diana Guttman to the AUTHORS file.

Change-Id: I44f3be48b03c6163188ede300bf7ba5919219294
Signed-off-by: Christopher M. Cantalupo <9cf3ecca60a3dd7112ab0e7250bedb8a752e3958@intel.com>

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