new_release.sh helper considers -v option as illegal

From new_release.sh help:

Usage: ./helpers/new_release.sh [OPTION].. [MODE [BRANCH]]
Turris OS new releases managing tool.

Options:
  -v  Run script with verbose output
  -h  Print this help text
Modes:
  verify
    Run script in verify mode where BRANCH (in default hbk) is checked
    for possible release problems. This is default.
...

Expected behaviour:

./helpers/new_release.sh -v verify or ./helpers/new_release.sh -v runs the script in "verify" mode with verbose output.

Actual behaviour:

The script writes Illegal option '-v' to stdout and exits with code 1.

Happens in all branches.