v0.5.21

What's Changed

• structured issues by @neuronflow in #78
• Merge pull request #78 from BrainLesion/structured_issues by @neuronflow in #79
• Structured issues by @neuronflow in #80
• new: blacked by @neuronflow in #81
• • reduce fig sizes to prevent resizing in notebooks and readme by @MarcelRosier in #83
• • add lint and format action by @MarcelRosier in #84
• Modular metrics by @Hendrik-code in #71

Full Changelog: v0.5.20...v0.5.21