Log file always available

[xescugc]

Abstract

Be able to always have the logs available with the information of the last run with -v

Proposal

Always write the logs of the last run to $XDG_CACHE_HOME. Should also be able to be modifield with --log-file=path or LOG_FILE=path.

Implementation

Just always initialize the log writter to the LOG_FILE and if the -v is used then use a io.MultiWriter.

Open issues (if applicable)