The main reason for this is to get a bug fix for Unicode command line processing that will enable me to remove a hack in fmslogo.cpp. However, it's also good to stay up-to-date on libraries to minimize the number of problems caused by each upgrade.
This library update cooresponds with a major version number increase in FMSLogo from 7.7.0 to 8.0.0. It's good to include a potentially disruptive change to a library in major version increase, since it's somewhat expected that things will be incompatible and possibly be broken.