Update README and CHANGELOG
[skip ci]
@@ -10,6 +10,7 @@ and this project adheres to [Semantic Versioning](http://semver.org/spec/v2.0.0.
- Experimental support for errors (it was supported in 1.5.0 but
undocumented).
- Added proper HTML5 serialization.
+- Added option `:max_tree_depth` to control the maximum parse tree depth.
### Changed
- Integrated [Gumbo parser](https://github.com/google/gumbo-parser) into
