Make the version option a number instead of a string

[sindresorhus]

@silverwind Why is it a string? It feels more natural for it to be a number.

[silverwind]

No real reason, but if we want to stay consistent with internal-ip, is-ip, is-cidr, ip-regex, cidr-regex, it would have to be methods, e.g. isOnline.{v4,v6}() and isOnline() being a separate method that possibly checks both (thought, I'm not sure if someone with only IPv6 working can be considered online, so probably best to keep it to v4 only).

[sindresorhus]

Having methods for it doesn't make sense here as it's an obscure option almost no one will need.

[sindresorhus]

This is not important, so we can just make sure to change to accept a number instead in the next major version.

[sindresorhus]

I would also like to rename the option to ipVersion as it's not obvious when just reading it that it's for IP.

[deadcoder0904]

@sindresorhus should I make version a number instead of a string & send a PR as it makes sense imo?

[sindresorhus]

@deadcoder0904 Nah, the issue is here so we can do the change if we need to do another major release. It's not doing a major release just for this.