Add ZVV backend

lib/Travel/Status/DE/HAFAS/Services.pm.PL

@@ -203,7 +203,8 @@ my %hafas_instance = (
 		),
 		stopfinder => 'https://fahrplan.vos.info/bin/ajax-getstop.exe',
 	},
-	VRN => { load_instance( 'de/vrn', lang => 'deu' ), }
+	VRN => { load_instance( 'de/vrn', lang => 'deu' ), },
+	ZVV => { load_instance( 'ch/zvv', lang => 'deu' ), },
 );
 
 my $perlobj = Data::Dumper->new( [ \%hafas_instance ], ['hafas_instance'] );