add message when CSV renaming results in no matches

bump version to v1.9.1

update version number

Bump version to 1.7.2

Improve help output and quiet mode

- A short help message is now shown if F2 is run without arguments
- Quiet mode no longer suppresses error messages

Bump version to v1.7.0

Release v1.6.7

Refactoring and bug fixes

- Better docs
- Fix bug where generate a new target path could unwittingly
overwrite an existing file

Release v1.6.5