Update changelog

CHANGELOG.md

@@ -16,6 +16,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 - Added runtime syntax configuration option `syntax` to help handle ambiguous syntax. By default, StyLua builds and runs with a parser to handle all Lua versions. However, the syntax of some Lua versions conflict with eachother: most notably, Lua 5.2+ goto label syntax `::label::` and Luau type assertion operator `::`. This option allows choosing what syntax to parse, to handle these conflicts. ([#407](https://github.com/JohnnyMorganz/StyLua/issues/407))
 - Added configuration option `space_after_function_names` to specify whether to include a space between a function name and parentheses ([#839](https://github.com/JohnnyMorganz/StyLua/issues/839))
+- Added flag `--allow-gitignore` to continue formatting files listed in a `.gitignore` file, instead of skipping over them ([#895](https://github.com/JohnnyMorganz/StyLua/issues/895))
 
 ### Changed