docs: update CHANGELOG

Author: gnikit

CHANGELOG.md

@@ -9,6 +9,8 @@ and this project adheres to [Semantic Versioning](http://semver.org/).
 
 ### Added
 
+- Added schema support for fortls configuration files with autocopmletions
+  ([#745](https://github.com/fortran-lang/vscode-fortran-support/issues/745))
 - Added Nightly Release Channel for the extension that triggers every day at 00:00 UTC.
 - Added new settings for disabling Linter initialization and display of initialization Diagnostics
   `fortran.linter.initialize` and `fortran.experimental.keepInitDiagnostics`