v3.0.0
This version introduces geoext 4.0.0 with openlayers 6.5.0
A step-by-step guide to update an application that uses BasiGX and geoext can be found here: https://github.com/terrestris/BasiGX/wiki/Update-application-to-ol-6.5.0,-geoext-4.0.0,-BasiGX-3.0.0