With 0.4.0 your CFDs are perpetual positions that are extended hourly. This means your CFD position will remain open forever unless you decide to close it. A funding fee is collected hourly when the CFD is extended.
With 0.4.8 you can open long and short positions, previously only long positions were possible.
With 0.5.0 you can chose from different from leverage. Leverage choices are configured by the maker and might initially be restricted to x1, x2 and x3.
This release fixes a rare but critical bug where the state of the application was not updated correctly resulting in unexpectedly force-closing positions.
Furthermore, this release improves connection stability.
It is recommended to update to this version to ensure position are not unexpectedly force-closed.