fix: support binding an ipv6 address

[Julien00859]

closes #68

[CLAassistant]

All committers have signed the CLA.

[Julien00859]

I also tried the following to save up the dns request:

def family_ip(address):
    try:
        ipaddress.IPv4Address(address)
        return socket.AF_INET
    except ipaddress.AddressValueError:
        try:
            ipaddress.IPv6Address(address)
            return socket.AF_INET6
        except ipaddress.AddressValueError:
            return socket.getaddrinfo(address, 0, type=socket.SOCK_STREAM)[0][0]

But it was slower than doing always the dns request

The CLA assistant is super cool btw :D

[jvdprng]

Thanks, just one lint issue but I can fix it!

[Julien00859]

Sorry for the lint issue, we use single-quote-for-technical-string at work and I totally forgot that the rest of the world agrees on using double quotes everywhere. I'll pay attention for future PRs!