Assert public ip is ipv4

[buffalu]

Problem:

• When running a GET request against ifconfig.me, sometimes the service returns an IPv6 address.
• This IP address is passed to the validator and the validator attempts to parse it as IPv4.

Fix:

• This fix asserts the IP address is IPv4 with detailed instructions on how to fix it.

Longer term, need to look at IP address providers that provide an option to only get IPv4 addresses back.