1.31.0

Improvements

• improve shebang generation/handling, shell compatibility by @desultory in #187
• add tests with dash shell by @desultory in #188
• add ksh test by @desultory in #189
• improve POSIX shell compatibility, fix quoting by @desultory in #191
• color log detected btrfs root subvol by @desultory in #193

Changes

• use format strings with printf by @desultory in #182
• refactor cryptsetup unlocks by @desultory in #183
• make check_var posix compatible by @desultory in #185
• make prompt_user posix compatible by @desultory in #186
• bup by @desultory in #190
• fix typo (printfs -> printf) by @desultory in #192
• use \033 instead of \e for more shell compat by @desultory in #194

Full Changelog: 1.30.1...1.31.0