v0.8.4

IntervalMatrices v0.8.4

Diff since v0.8.3

Merged pull requests:

• Update scripts (#206) (@schillic)
• Use Julia v1.8 in CI (#207) (@schillic)
• Update scripts/README/Project/docs, format code, fix linter warning, remove type piracy (#208) (@schillic)
• Change formatter rule and format test code (#209) (@schillic)
• Format test code (#210) (@schillic)
• Some minor changes and tests (#211) (@schillic)