Update changelog for #342

Author: axelson

CHANGELOG.md

@@ -11,6 +11,7 @@ Improvements:
 - Use ElixirSense's error tolerant parser for document symbols (thanks [Łukasz Samson](https://github.com/lukaszsamson)) [#322](https://github.com/elixir-lsp/elixir-ls/pull/322)
 - Add more auto-completion trigger characters: `& % ^ : !` (thanks [Łukasz Samson](https://github.com/lukaszsamson)) [#327](https://github.com/elixir-lsp/elixir-ls/pull/327)
 - Disable busy-wait in BEAM to reduce CPU usage (thanks [Jason Axelson](https://github.com/axelson)) [#331](https://github.com/elixir-lsp/elixir-ls/pull/331)
+- Update HoverProvider to return MarkupContent (thanks [Jonathan Arnett](https://github.com/J3RN)) [#342](https://github.com/elixir-lsp/elixir-ls/pull/342)
 
 House keeping:
 - Use error tolerant parser for WorkspaceSymbols (thanks [Łukasz Samson](https://github.com/lukaszsamson)) [#322](https://github.com/elixir-lsp/elixir-ls/pull/322)