Updates CHANGELOG.md

Author: gnikit

CHANGELOG.md

@@ -7,6 +7,14 @@ and this project adheres to [Semantic Versioning](http://semver.org/).
 
 ## [Unreleased]
 
+## [2.6.2]
+
+### Added
+
+- Adds Don't Show Again option when failing to spawn `fortls`, Fortran Intellisense
+  pop-up has already been removed
+  ([#303](https://github.com/krvajal/vscode-fortran-support/issues/303))
+
 ## [2.6.1]
 
 ### Fixed