Specify which tag to build #20

I want to have the chance to build the release of a specific tag, e.g. --tags=0.1.0.
This would create the release notes based on the tag 0.1.0 and the previous one.

I also want to specify the range between two tags, so --tags=2.0.0,1.0.0 would create the release notes with all the issues closed between those two tags.