games/pysolfc: Update to 3.0.0

• Update the installation/upgrade instructions in the pkg-message regarding the games/pysolfc-cardsets port, which has now been in the FreeBSD ports tree for some time and can be installed if further cardsets are to be used.

Changelog:

https://github.com/shlomif/PySolFC/blob/pysolfc-3.0.0/NEWS.asciidoc