Update README download link to v1.1

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Initial release: WinUnix v1.0

8 Linux/Unix tools natively compiled for Windows 11:
ps, pstree, top, htop, df, du, free, uname

All tools support the same flags as their Linux counterparts.
Statically compiled with MSVC - no runtime dependencies.