Confirm / update SHA256 signature of source release to fix Homebrew installer

Hi David,

It looks like the homebrew package manager has an incorrect SHA256 checksum for the latest release of frotz, so can't download/build it. Can you confirm what the SHA256 checksum should be for the file frotz-2.54.tar.bz2?

The last update to the homebrew formula for frotz was here and indeed when I pull the source archive it indeed no longer matches the SHA256 checksum it seems to have had at the time.