No option to create code-signing intermediate or certificates

[michaelkrieger]

Per OpenSSL PKI Tutorial and its sample configuration file, a code-signing certificate is also an option that would complete spki.

All that should be required is making an intermediate with some variation of:
extendedKeyUsage = serverAuth, clientAuth, codeSigning

[kaysond]

Good suggestion thanks. If you can submit a PR that'd be great. I can probably get to it by the end of the month otherwise.