Add changes to close issue #894 to CHANGELOG.md

Author: marcnjaramillo

extensions/ql-vscode/CHANGELOG.md

@@ -2,6 +2,10 @@
 
 ## [UNRELEASED]
 
+## 1.5.6 - 30 September 2021
+
+- Remove line about selecting a language from the dropdown when downloading database from LGTM. This makes the download progress visible when the popup is not expanded. [#894](https://github.com/github/vscode-codeql/issues/894)
+
 ## 1.5.5 - 08 September 2021
 
 - Fix bug where a query is sometimes run before the file is saved. [#947](https://github.com/github/vscode-codeql/pull/947)