update changelog

Author: bobbrow

CHANGELOG.md

@@ -1,9 +1,12 @@
 # What's New?
 
 ## 1.3.1
+Improvements:
+- Show "Collapse all" command on project outline view. [#839](https://github.com/microsoft/vscode-cmake-tools/issues/839) [@dirondin](https://github.com/dirondin)
+
 Bug Fixes:
 - Toolset and platform are swapped when reading from CMake cache. [#1065](https://github.com/microsoft/vscode-cmake-tools/issues/1065)
-- Unable to debug targets when path is specified as absolute by the cmake-file-api. [#1067](https://github.com/microsoft/vscode-cmake-tools/issues/1067)
+- Unable to debug targets when path is specified as absolute by the cmake-file-api. [#1067](https://github.com/microsoft/vscode-cmake-tools/issues/1067) [@KoeMai](https://github.com/KoeMai)
 
 ## 1.3.0
 Improvements: