update changelog (#4048)

Author: gcampbell-msft

CHANGELOG.md

@@ -1,12 +1,15 @@
 # What's New?
 
+## 1.19.51
+
+- Fix generator and preferredGenerator logic. [#4031](https://github.com/microsoft/vscode-cmake-tools/issues/4031), [#4005](https://github.com/microsoft/vscode-cmake-tools/issues/4005), [#4032](https://github.com/microsoft/vscode-cmake-tools/issues/4032)
+
 ## 1.19.50
 
 Bug Fixes:
 
 - Fix env expansion of all variables (toolchainFile, etc.) in presets. [#4019](https://github.com/microsoft/vscode-cmake-tools/issues/4019)
 - Fix issues with inheritance and presets. [#4023](https://github.com/microsoft/vscode-cmake-tools/issues/4023)
-- Fix generator and preferredGenerator logic. [#4031](https://github.com/microsoft/vscode-cmake-tools/issues/4031), [#4005](https://github.com/microsoft/vscode-cmake-tools/issues/4005), [#4032](https://github.com/microsoft/vscode-cmake-tools/issues/4032)
 
 ## 1.19.49