DEVELOPERS: remove Andrew Ruder

His e-mail address is bouncing:

<andrew.ruder@elecsyscorp.com>: host mx1-us1.ppe-hosted.com[67.231.154.162]
    said: 550 5.7.1 <andrew.ruder@elecsyscorp.com>: Recipient address rejected:
    User email address is marked as invalid. (in reply to RCPT TO command)

Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>