v0.6.1 improved error handling

What's Changed

• README.md: Backup from stdin - clarify src variable and add example for a backup job using stdin by @z-bsod in #40
• Bump actions/checkout from 2.3.5 to 2.4.0 by @dependabot in #41
• Bump github/super-linter from 4.8.1 to 4.8.4 by @dependabot in #43
• Fix support for systemd OnCalendar by @lisuml in #44
• Fix #45: send email also on the main command failure by @lisuml in #46

New Contributors

• @z-bsod made their first contribution in #40
• @lisuml made their first contribution in #44

Full Changelog: v0.6.0...v0.6.1