Add role position editing to audit log

Now there is no way to find out who changed the position of the role and why, which causes confusion and distrust of your own moderators. There is a method in the Discord API that allows you to change role positions and also allows you to specify the "X-Audit-Log-Reason" header. This raises the question: why do we need the "X-Audit-Log-Reason" header if the change itself does not show up in the audit log? https://discord.com/developers/docs/resources/guild#modify-guild-role-positions