Update changelog for #384

Author: axelson

CHANGELOG.md

@@ -7,6 +7,9 @@ Bug Fixes:
 - Fix formatting on windows (thanks [Po Chen](https://github.com/princemaple)) [#375](https://github.com/elixir-lsp/elixir-ls/pull/375)
 - Improve formatting speed (thanks [Matt Baker](https://github.com/mattbaker)) [#390](https://github.com/elixir-lsp/elixir-ls/pull/390)
 
+Housekeeping:
+- Add GitHub action to auto-publish releases (thanks [Po Chen](https://github.com/princemaple)) [#384](https://github.com/elixir-lsp/elixir-ls/pull/384)
+
 ### v0.6.1: 4 October 2020
 
 VSCode: