Ipify2

- [CHANGED] Fix README and documentation
- [ADDED] Added `get_ipv6` function (redirects to `get_universal_ip`)

**Full Changelog**: https://github.com/nwithan8/ipify2/compare/1.0.2...1.1.0

Minor updates to the original ipify package, which has been abandoned for several years now and no longer works properly on Python 3.8+ as a result.

This replaces/corrects the incorrect dependencies, and adds support for the api64.ipify.org endpoint for optional IPv6 addresses