Update Changelog for release of version 4.5.1

CHANGELOG.md

@@ -2,6 +2,10 @@
 
 All notable changes to the LaunchDarkly Go SDK will be documented in this file. This project adheres to [Semantic Versioning](http://semver.org).
 
+## [4.5.1] - 2018-11-15
+### Fixed:
+* Previously, the DynamoDB feature store implementation could fail if a feature flag contained an empty string in any property, since DynamoDB does not allow empty strings. This has been fixed by storing a JSON representation of the entire feature flag, rather than individual properties. The same implementation will be used by all other LaunchDarkly SDKs that provide a DynamoDB integration, so they will be interoperable.
+
 ## [4.5.0] - 2018-11-14
 ### Added:
 - It is now possible to use DynamoDB or Consul as a persistent feature store, similar to the existing Redis integration. See the [`ldconsul`](https://godoc.org/gopkg.in/launchdarkly/go-client.v4/ldconsul) and [`lddynamodb`](https://godoc.org/gopkg.in/launchdarkly/go-client.v4/lddynamodb) subpackages, and the reference guide to ["Using a persistent feature store"](https://docs.launchdarkly.com/v2.0/docs/using-a-persistent-feature-store).