Update CHANGELOG.md

Co-authored-by: Robb Kidd <[email protected]>

CHANGELOG.md

@@ -4,6 +4,13 @@
 
 ⚠️  Minimum libhoney version is now 2.3.0 ⚠️
 
+Previously the minimum libhoney was 1.14.2. Backwards-incompatible changes in [libhoney 2.0.0](https://github.com/honeycombio/libhoney-rb/releases/tag/v2.0.0):
+
+* Removal of the deprecated Array input for http proxy configuration.
+  * If you are using the Beeline in services that must send web traffic through an out-going proxy, see [libhoney 1.x proxy_config deprecation warning](https://github.com/honeycombio/libhoney-rb/blob/v1.21.0/lib/libhoney/client.rb#L273-L276) for recommended configuration.
+* Drop support for Ruby versions 2.2 and 2.3.
+  * Beeline Ruby already requires a minimum Ruby 2.5.
+
 ### Enhancements
 
 - feat: support classic ingest keys (#238) | Robb Kidd