BR 2826669: update licensing information in README
BR 2826669: update licensing information in README

The code is now under the 2-clause BSD license.

Signed-off-by: H. Peter Anvin <8a453bad9912ffe59bc0f0b8abe03df9be19379e@zytor.com>

projedi/nasm,techkey/nasm,Distrotech/nasm,letolabs/nasm,projedi/nasm,techkey/nasm,turingstudio/nasm,Distrotech/nasm,techkey/nasm,letolabs/nasm,turingstudio/nasm,letolabs/nasm,Distrotech/nasm,techkey/nasm,projedi/nasm,projedi/nasm,projedi/nasm,turingstudio/nasm,techkey/nasm,turingstudio/nasm,Distrotech/nasm