Correct URL for Thomas Scherrer's Z80 Pages in the Bibliography

[borchers]

The Bibliography (p.225 in the latest PDF) contains a link in reference [3], "Z80 Family Official Support Page by Thomas Scherrer", that currently points to a dead Geocities page. Geocities closed down in October 2009, and while there is an old snapshot of Thomas' pages from before that on the Internet Archive, the current version of his pages is actually at https://z80.info. That URL does appear in a footnote elsewhere in the book, but it should also be used here in the Bibliography.

[tomaz]

Thanks!