Git commits in Moodle 3.8.3 by fujiwara

commit 926277865cb1167e290fc0dcc2bffa38f7cd329f
Author: fujiwara <shintaro.fujiwara@gmail.com>
Date:   Mon, 04 May 2020 20:43:57 +0800
Tag:    v3.8.3

MDL-68415 email: Fix attachment in email_to_user()