Update changelog

Author: bobbrow

Extension/CHANGELOG.md

@@ -1,9 +1,10 @@
 # C/C++ for Visual Studio Code Change Log
 
-## Version 1.0.1-insiders: September 16, 2020
+## Version 1.0.1: September 21, 2020
 ### Bug Fixes
 * Fix IntelliSense breaks on linux/macOS when `#error` directives are present in the source code. [#6009](https://github.com/microsoft/vscode-cpptools/issues/6009), [#6114](https://github.com/microsoft/vscode-cpptools/issues/6114)
 * Fix issue on Windows with the language server not shutting down properly which causes the IntelliSense database to become corrupted. [PR #6141](https://github.com/microsoft/vscode-cpptools/issues/6141)
+* Fix IntelliSense breaks when predefined macros are undefined. [#6147](https://github.com/microsoft/vscode-cpptools/issues/6147)
 
 ## Version 1.0.0: September 14, 2020
 ### New Features