pkgchkxx-0.2.4

• pkgrrxx -u now displays a progress bar while checking for outdated packages, if stderr is a tty.
• Fix an issue where pkgchkxx -u can access invalidated memory and then crash. The bug was introduced at version 0.2.2. Reported by @ryoon [#9] and @0323pin [#10].
• Fix the formatting of pkgchkxx displaying commands to run. There was a space missing between time and command.
• Fix pkgchkxx -un not simulating the effect of pkg_delete -r. The same issue exists in the original pkg_chk but it'd be nice to fix it.