use YYYYMMDD only in make.sh not in release.sh
simplify readme
DiscoCheck 4.3 (7092365)
I had to remove -flto for the Windows compiles, because this option is broken in mingw-w64. Signatures were slightly different, so I'm going for the safer option: make a correct, but slightly slower compile. Hopefully mingw-w64 package will eventually be updated in the Debian repo to include more recent versions of GCC and the bug will disappear.