Update changelog for 1.4.0-insiders (#7476)

* Update changelog.

Author: sean-mcmanus

Extension/CHANGELOG.md

@@ -1,5 +1,30 @@
 # C/C++ for Visual Studio Code Change Log
 
+## Version 1.4.0-insiders: May 10, 2021
+### Enhancements
+* Update to clang-format 12. [#6434](https://github.com/microsoft/vscode-cpptools/issues/6434)
+* Fix file:line path for $FILEPOS [#7193](https://github.com/microsoft/vscode-cpptools/issues/7193)
+	* [#1124](https://github.com/microsoft/MIEngine/pull/1124)
+* Add `stopAtConnect` and `hardwareBreakpoints` launch options [PR #7449](https://github.com/microsoft/vscode-cpptools/pull/7449) 
+  * `stopAtConnect` stops the debugger on connection to a remote target [PR MIEngine#1109](https://github.com/microsoft/MIEngine/pull/1109)
+  * `hardwareBreakpoints` controls usage and number of remote hardware breakpoints [PR MIEngine#1128](https://github.com/microsoft/MIEngine/pull/1128)
+* Add support for loading Concord extensions to the cppvsdbg debug adapter (see [documentation](https://github.com/microsoft/ConcordExtensibilitySamples/wiki/Support-for-VS-Code-cppvsdbg-Scenarios) for more information)
+* Add support for exception conditions to cppvsdbg (see [documentation](https://aka.ms/VSCode-Cpp-ExceptionSettings) for more information)
+
+### Bug Fixes
+* Fix IntelliSense configuration with cl.exe compiler args `/external:I`, `/Zc:preprocessor`, and others. [#4980](https://github.com/microsoft/vscode-cpptools/issues/4980), [#6531](https://github.com/microsoft/vscode-cpptools/issues/6531), [#7259](https://github.com/microsoft/vscode-cpptools/issues/7259)
+* Fix provider failed error logging. [#5487](https://github.com/microsoft/vscode-cpptools/issues/5487)
+* Fix -idirafter directories being included too early. [#7129](https://github.com/microsoft/vscode-cpptools/issues/7129)
+* Filter out C++ std when querying the compiler as C (and vice versa). [#7269](https://github.com/microsoft/vscode-cpptools/issues/7269)
+* Fix files.exclude ending with `/folder/**` not excluding `/folder`. [#7331](https://github.com/microsoft/vscode-cpptools/issues/7331)
+* Fix VS Code UI freezing when hovering over very large literals. [#7334](https://github.com/microsoft/vscode-cpptools/issues/7334)
+* Fix clang-format formatting bug when new lines are removed. [#7360](https://github.com/microsoft/vscode-cpptools/issues/7360)
+* Change default cwd in launch.json to `${fileDirname}`. [#7362](https://github.com/microsoft/vscode-cpptools/issues/7362)
+  * Syed Ahmad (@HackintoshwithUbuntu) [PR #7363](https://github.com/microsoft/vscode-cpptools/pull/7363)
+* Fix a crash on Linux with a `/**` includePath.
+* Fix the compile commands entry not being used when -Werror is used. [#7388](https://github.com/microsoft/vscode-cpptools/issues/7388)
+* Fix some potential race conditions during vsix installation. [#7405](https://github.com/microsoft/vscode-cpptools/issues/7405)
+
 ## Version 1.3.1: April 19, 2021
 ### Bug Fixes
 * Fix extension not activating when `/.vscode/c_cpp_properties.json` exists but no C/C++ file is open. [#7344](https://github.com/microsoft/vscode-cpptools/issues/7344)