Update Changelog for Release v3.0.0

CHANGELOG.md

@@ -0,0 +1,36 @@
+# Changelog
+
+## [v3.0.0](https://github.com/recurly/recurly-client-go/tree/HEAD)
+
+[Full Changelog](https://github.com/recurly/recurly-client-go/compare/v3.0.0-beta.1...HEAD)
+
+## Breaking Changes
+
+If you are upgrading from 3.0.0-beta.1, there is [1 breaking change](https://github.com/recurly/recurly-client-go/pull/25/files). We have removed `DefaultClient` in place of `NewClient(string)`:
+
+Change this:
+```go
+recurly.APIKey = "<apikey>"
+client := recurly.DefaultClient()
+```
+
+To:
+```go
+client := recurly.NewClient("<apikey>")
+```
+
+**Implemented enhancements:**
+
+- Add some more scripts and bump to 3.0.0 [\#26](https://github.com/recurly/recurly-client-go/pull/26) ([bhelx](https://github.com/bhelx))
+- Adds `NewClient` and removes `DefaultClient` [\#25](https://github.com/recurly/recurly-client-go/pull/25) ([bhelx](https://github.com/bhelx))
+- Only log warnings and errors [\#24](https://github.com/recurly/recurly-client-go/pull/24) ([bhelx](https://github.com/bhelx))
+- Implement Pager.Count\(\) [\#23](https://github.com/recurly/recurly-client-go/pull/23) ([bhelx](https://github.com/bhelx))
+- Add some tests [\#22](https://github.com/recurly/recurly-client-go/pull/22) ([joannasese](https://github.com/joannasese))
+
+**Merged pull requests:**
+
+- add beta warning [\#20](https://github.com/recurly/recurly-client-go/pull/20) ([bhelx](https://github.com/bhelx))
+
+
+
+\* *This Changelog was automatically generated by [github_changelog_generator](https://github.com/github-changelog-generator/github-changelog-generator)*