Git commits in Moodle 3.8.x by Vlad Apetrei

commit 8cb90066d4714d661f9c271e0011087f5848907e
Author: Vlad Apetrei <vladap3@gmail.com>
Date:   Mon, 17 Jun 2019 05:28:10 +0800
Tag:    v3.8.0-beta

MDL-58992 analytics: add multi-classification to predictors