== 4.0.3
* New Features
* Support unicode-range
* Bugfixes
* Blank stylesheet is now considered valid
* Fix long parsing times on certain unusual comment constructs
* Reduce memory usage when parsing long (data:) URIs
== 4.0.2
* Bugfixes
* Allow @font-face in places where it should be allowed
== 4.0.1
* Bugfixes
* Update parsing for calc
* Update parsing for Mozilla-specific pseudo elements
== 4.0.0
* New Features
* Support for parsing many new CSS features, including `:not`, `calc`, and `@supports`.
* Line number and context in parser error messages
* Some nodes types will remember their start and end positions, allowing developers to retrieve their original code.
* Bugfixes
* Updated parsing for unusual syntax.
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