enumerate output files in `/steps`

See #177, release log:

• 2edda10 by @h1alexbel: chore: typo
• 91cfb67 by @rultor: Merge branch '__rultor'
• fc4c89f by @h1alexbel: feat(#177): more quotes
• ac8240f by @h1alexbel: feat(#177): quotes
• a8b14c6 by @h1alexbel: feat(#177): id
• ad9de4a by @h1alexbel: feat(#177): id
• 765ca03 by @h1alexbel: feat(#177): for done
• 2d2011e by @rultor: Merge branch '__rultor'
• 28a23c8 by @rultor: Merge branch '__rultor'

Released by Rultor 2.0-SNAPSHOT, see build log