#121 Add camera Panasonic G9

[Jona Janzwech]

Panasonic G9 is missing in https://sourceforge.net/p/lensfun/code/ci/master/tree/data/db/mil-panasonic.xml:

Exiv2

Exif.PanasonicRaw.Make                       Ascii      10  Panasonic
Exif.PanasonicRaw.Model                      Ascii       6  DC-G9

XML

    <camera>
        <maker>Panasonic</maker>
        <model>DC-G9</model>
        <mount>Micro 4/3 System</mount>
        <cropfactor>2</cropfactor>
    </camera>

[seebk]

Thanks, it is now in git master database.