DEVELOPERS: remove Gregory Hermant
The Calao Systems company has gone bankrupt in April 2016, and the
domain name no longer exists, so there is no chance to ever contact
Gregory Hermant at a @calao-systems.com address, so let's remove his
entry from the DEVELOPERS file.
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
Thomas Petazzoni