Update CHANGELOG for v3.16.0

Author: andyleejordan

CHANGELOG.md

@@ -1,5 +1,13 @@
 # PowerShell Editor Services Release History
 
+## v3.16.0
+### Wednesday, January 03, 2024
+
+- 🐛 📟 [vscode-powershell #4854](https://github.com/PowerShell/PowerShellEditorServices/pull/2125) - Update shell integration script to fix command decorations.
+- ✨ 🚨 [PowerShellEditorServices #2124](https://github.com/PowerShell/PowerShellEditorServices/pull/2124) - Test end-to-end with PowerShell Daily.
+- ✨ 👷 [PowerShellEditorServices #2114](https://github.com/PowerShell/PowerShellEditorServices/pull/2114) - Add PowerShell 7.4 SDK and `net8.0` framework.
+- ✨ 🚨 [PowerShellEditorServices #2110](https://github.com/PowerShell/PowerShellEditorServices/pull/2110) - Switch to GitHub Actions for all CI.
+
 ## v3.15.0
 ### Thursday, December 07, 2023