Update version number in AppVeyor automated build config.
Update version number in AppVeyor automated build config.

LeForgeron/povray,POV-Ray/povray,wfpokorny/povray,POV-Ray/povray,LeForgeron/povray,c-lipka/povray,LeForgeron/povray,wfpokorny/povray,POV-Ray/povray,wfpokorny/povray,POV-Ray/povray,LeForgeron/povray,POV-Ray/povray,LeForgeron/povray,LeForgeron/povray,c-lipka/povray,POV-Ray/povray,POV-Ray/povray,c-lipka/povray,wfpokorny/povray,wfpokorny/povray,LeForgeron/povray,wfpokorny/povray,c-lipka/povray,wfpokorny/povray,LeForgeron/povray