Every time I launch via MultiMC I get the below warning in the log:

[main/WARN]: Mod `lightoverlay` (4.1) uses 'requires' key in fabric.mod.json, which is not supported - use 'depends'

It doesn't seem to be causing any current problems but I thought it worth flagging up in case compatibility gets broken in future Fabric versions.

Running MultiMC version 0.6.7-1316 with the latest Minecraft and Fabric (Minecraft 1.15.1 and Fabric version 0.7.3+build.176) as available through MultiMC.