I've multiple python packages installed on my system. My update script calls `pip-review --local --auto` to update all the python packages. However, I don't want to update all packages. What I want is `pip-review` to update all packages except `scons`, since one of my programs needs an older version of `scons`. Currently to do this, I run `pip-review --local --auto && python3 pip uninstall -y scons && python3 -m pip install -Iv scons==3.1.2` which updates all packages and then uninstalls the new version of `scons` and then re-installs it with a specific version number. Is there a nicer way to do this?