Update tox from 2.9.1 to 3.0.0
Update tox from 2.9.1 to 3.0.0
DXCanas/kolibri,mrpau/kolibri,DXCanas/kolibri,benjaoming/kolibri,indirectlylit/kolibri,lyw07/kolibri,DXCanas/kolibri,DXCanas/kolibri,learningequality/kolibri,lyw07/kolibri,learningequality/kolibri,learningequality/kolibri,indirectlylit/kolibri,indirectlylit/kolibri,mrpau/kolibri,lyw07/kolibri,lyw07/kolibri,jonboiser/kolibri,jonboiser/kolibri,jonboiser/kolibri,mrpau/kolibri,mrpau/kolibri,jonboiser/kolibri,learningequality/kolibri,benjaoming/kolibri,indirectlylit/kolibri,benjaoming/kolibri,benjaoming/kolibri