brename v2.5.2

Changelog

• add flag --nr-width to fill leading 0s for {nr}. e.g.,

    $ brename -f '.jpeg' -e -p '(.+)' -r 'pic-{nr}' --nr-width 3 -d
    [INFO] checking: [ ok ] 'a.jpeg' -> 'pic-001.jpeg'
    [INFO] checking: [ ok ] 'b.jpeg' -> 'pic-002.jpeg'
    [INFO] 2 path(s) to be renamed