Small problem with error message

[KeisukeShima]

Hello, thanks for providing a nice tool.
I found a small problem today and I would like to report here.

In cut.py, there is a place where it is not f-string.
https://github.com/Kettenhoax/ros2bag_tools/blob/master/ros2bag_tools/ros2bag_tools/filter/cut.py#L111

The solution is:

                + f'duration of the input bags ({bag_start}, {bag_end})')

[Kettenhoax]

Good catch, thanks!