Ipinfo

- Patch fix for handler crashing in windows environment.
- Added bogon check locally.

- Added `CountryFlag` to the details object.
- Added `CountryCurrency` to the details object.
- Added `Continent` to the details object.
- Handled timeour error properly.

- Patch fix to include `eu.json` in manifest for release.

- Added `isEU` to the details object to check whether the IP geolocates to a
European Union (EU) country.

- Allow deleting from the cache via the `del` keyword, e.g.
`del handler.cache[ip_key]`.

- Cache keys are now versioned.
This allows more reliable changes to cached data in the future without
causing confusing incompatibilities. This should be transparent to the user.
This is primarily useful for users with persistent cache implementations.
- Add Map integration.
See https://ipinfo.io/map for details.