fix plugin.id in plugin.xml
fix plugin.id in plugin.xml

Currently contains the old id, "uk.co.whiteoctober.cordova.appversion", which causes problems with plugin management with e.g. Ionic. Replaced with correct "cordova-plugin-app-version".
whiteoctober/cordova-plugin-app-version,whiteoctober/cordova-plugin-app-version,whiteoctober/cordova-plugin-app-version