add a missing require
add a missing require

cappadona/wagon,jaykay/wagon,benknowles/wagon,masm/wagon,masm/wagon,ipmobiletech/locomotivecms-wagon,haunt-digital/wagon,cappadona/wagon,benknowles/wagon,haunt-digital/wagon,ipmobiletech/locomotivecms-wagon,infinum/wagon,jaykay/wagon,infinum/wagon,locomotivecms/wagon,locomotivecms/wagon,haunt-digital/wagon,cappadona/wagon