Update changelog for 1.8.4 (#8778)

Author: Colengms

Extension/CHANGELOG.md

@@ -1,5 +1,12 @@
 # C/C++ for Visual Studio Code Change Log
 
+##  Version 1.8.4: February 7, 2022
+### Bug Fixes
+* Suppress incorrect warnings on ARM64 macOS. [#8756](https://github.com/microsoft/vscode-cpptools/issues/8756)
+* Fix debugger regressions. [#8760](https://github.com/microsoft/vscode-cpptools/issues/8760)
+* Remove `Offline Installation` section from README.md. [#8769](https://github.com/microsoft/vscode-cpptools/pull/8769)
+* Fix performance issue with loading large PDBs. [#8775](https://github.com/microsoft/vscode-cpptools/issues/8775)
+
 ##  Version 1.8.2: January 31, 2022
 ### New Features
 * Add data breakpoints (memory read/write interrupts) with `gdb` debugging. [#1410](https://github.com/microsoft/vscode-cpptools/issues/1410)