v1.21

Fixes:

• Fix license conflict
• Fix usage
• Fix generated manpage

v1.2

Fixes:

• Fix dir and file existence checks in forloop
• Fix shellcheck warnings
• Fix usage and add readme perks
• Fix membership check on 'video' group (#1)

Enhancements:

• From GPLv2 to MIT
• Add option to display current value in percent (#2)

v1.1

Fixes:

• Moved OPTIND shifting
• Fixed shellchecks

Enhancement:

• POSIX-compliant

v1.0

Fix:

• Shellcheck warnings (double quoting)

v0.9

Fix:

• Set up permissions post-installation.