Log Message:
devel/serie: update to 0.4.0

 - Save current MSRV in manifest by @alerque in #44
 - Improve graph image calculation and add tests by @lusingander in #45
 - Fix ci by @lusingander in #47
 - Graph color config by @lusingander in #48
 - Half-width graph support by @lusingander in #50
 - Minor code cleanup by @lusingander in #51