Support https protocol using any certificate

[kanongil]

This fixes #65 by adding https support to getURL().

Note that I always set the rejectUnauthorized = false option, which disables the certificate validation checks. This is done to enable fetching from self-signed certificates, which are often used for local https development setups. This should be safe as long as it the method is only used for local resources.

[msftclas]

Hi @kanongil, I'm your friendly neighborhood Microsoft Pull Request Bot (You can call me MSBOT). Thanks for your contribution!

This seems like a small (but important) contribution, so no Contribution License Agreement is required at this point. Real humans will now evaluate your PR.

TTYL, MSBOT;

[roblourens]

Awesome, thanks.