rel: Prepare v1.16.0 release (#434)

## Which problem is this PR solving?
Prepares the next release of beeline-go library.

## Short description of the changes
- Add changelog entry
- Update version to 1.16.0

Author: MikeGoldsmith

CHANGELOG.md

@@ -1,6 +1,20 @@
 # beeline-go changelog
 
-## 1.15.9 2024-03-04
+## 1.16.0 2024-04-05
+
+### ⚠️ Breaking Changes ⚠️
+
+Minimum Go version required is 1.19
+
+### Maintenance
+
+- maint: drop go 1.18 (#432) | @codeboten
+- maint: group patch updates for go deps (#430) | @codeboten
+- maint: add labels to release.yml for auto-generated grouping (#426) | @JamieDanielson
+- maint(deps): bump the minor-patch group with 4 updates (#431) | @dependabot
+- maint(deps): bump the minor-patch group with 1 update (#433) | @dependabot
+
+## 1.15.0 2024-03-04
 
 ### Enhacements
 

version.go

@@ -1,3 +1,3 @@
 package beeline
 
-const version = "1.15.0"
+const version = "1.16.0"