v0.5.9-alpha.1

What's Changed

• feat(pro): add project-wise SSH keys by @89luca89 in #1086
• fix(cli): windows credential helper whitespace by @pascalbreuninger in #1087
• fix(build): abolish builds for too old glibc. by @89luca89 in #1090

Full Changelog: v0.5.9-alpha.0...v0.5.9-alpha.1