macOS Catalina compatibility, URL and email SANs, and more

macOS 10.15 Catalina introduced certificate lifespan limits which block mkcert certificates. As a temporary measure, mkcert certificates now have a fixed notBefore date of June 1st, 2019. Once the ACME server is implemented, certificate lifespan will be shortened to 3 months. (#174)

Certificates generated by previous versions of mkcert after July 1st, 2019 will not work on macOS 10.15 Catalina, and will have to be regenerated. The root CA is unaffected and there is no need to rerun mkcert -install.

URL (#166) and email (for S/MIME, #152) SANs are now supported.

Client certificates are now created with a -client filename suffix, and they claim the serverAuth EKU as well as the clientAuth one.

The certificate subject now includes the full user name, like [email protected] (Filippo Valsorda).

SLES, OpenSUSE (#162), Snapcraft (#116), and CentOS 7 (#120) are now supported.

Linux release binaries are now fully static, and will work regardless of the system libc. (#169)