Merge pull request #22 from ipdata/claude/update-ipdata-go-package-tDBG9

Add functional options pattern with WithHTTPClient option

Merge pull request #21 from ipdata/claude/update-ipdata-go-package-tDBG9

Update IP struct fields and migrate to Go modules

Merge pull request #17 from pushthat/master

Add carrier infos

Update README.md

0.7.1

- Update `README.md` file, to call correct methods on `Error` type
- Update copyright year in `LICENSE` file

0.7.0

- Add support for doing Bulk Lookups using the `BulkLookup()` method.

0.6.1 (More Breaking Changes!)

Change `ASN` field of `IP` to a new type to support API changes. The new `ASN`
struct type is used instead of a `string`, it itself contains an `ASN` field
that is the same value as the old `IP.ASN` string value.

0.6.0 (Breaking Changes!)

- require API key, as anonymous usage was removed from ipdata.co API, adds error
  value to `NewClient()`
- rename `Request()` to `RawLookup()`
- remove `DecodeIP` function as it's only a simple JSON unmarshaler
- remove support for RateLimit errors (API doesn't support 429s)
- export `Error` type, and give it a `Code() int` method for returning HTTP
  status and API error message (`Error()`)

The decision was to try and have only one final API breaking release.

0.5.0

*Note*: this includes a breaking API change. The `RawIP` type and `RawXXX`
 functions were removed, and the `IP` type was changed to be more like `RawIP`.

- update code to use new API authentication mechanism (query instead of header)
- update deserialization code to be simpler and to match new API version

0.4.1

This release properly increases the Version constant to match the release
number.