Changed `-D` option to always download the lists supplied, regardless of
the database directory being empty or not.
This means you can download additional lists after the first program
run, or re-download lists later on. It *will* overwrite your custom
changes however if your files are called the same as the default list
names.
Additionally removed dependency on GNU version of cut and added some
simple tests for the download functionality.
Fixes #16.
Adds another commandline option `-n` to the application which prevents
newlines from being added at the end of each output.
Disabled by default.
Co-authored-by: Marty Oehme <marty.oehme@gmail.com>
