Update changelog

Author: axelson

CHANGELOG.md

@@ -2,6 +2,7 @@
 
 - Update dialyxir to 1.0.0-rc.7
 - Improvements to `textDocument/documentSymbol`, now `DocumentSymbol` is returned instead of the more simplistic `SymbolInformation` (thanks to [Łukasz Samson](https://github.com/lukaszsamson) and [kent-medin](https://github.com/kent-medin)) [#76](https://github.com/elixir-lsp/elixir-ls/pull/76)
+- Support asdf-vm in wrapper scripts (thanks to [Cees de Groot](https://github.com/cdegroot)) [#78](https://github.com/elixir-lsp/elixir-ls/pull/78)
 
 ### v0.2.28: 16 Nov 2019