update README.md

Author: btb

README.md

@@ -3,7 +3,7 @@
 
 Revision 0 of this board is broken, [here's how to fix it](https://github.com/btb/DiskII/wiki/Revision-0-errata).
 
-[Revision 1](https://github.com/btb/DiskII/blob/main/gerbers_rev1.zip) has all known problems fixed.
+[Revision 1](https://github.com/btb/DiskII/releases/tag/rev1) has all known problems fixed.
 
 [Interactive BOM](https://btb.github.io/DiskII/bom/DiskII_rev1.html)