v0.6.2

• The "boolean attributes cannot have a value" error now puts squigglies under the attribute name instead of the value.
• Improved validation for <link> [crossorigin], it previously used its own implementation of CORS validation, while now it uses one central implementation shared by all other similar attributes.
• [lang] (and similar attributes) now accept the empty string as value, used to signify that the language is unknown.
• Fixed a condition that would cause the language server to attempt to detect html elements inside of svg elements.