New subjectAltName syntax in the README
New subjectAltName syntax in the README

Thanks to [openssl@bfa470a](https://github.com/openssl/openssl/commit/bfa470a4f64313651a35571883e235d3335054eb), we don't have to use such a cluster of a workaround to generate multi-domain CSRs

Leaving the old syntax in, however, for historical interest and for those stuck on such operating systems
diafygi/acme-tiny