v0.2.1

Changelog

e0f32fb Make lexer fixture running cleaner.
e56590a Add data-driven test framework for lexers.
d26f247 Support CSS Custom Property definitions.
c9f612c Fix broken css rules output
c6b01cb Ensure newline in diff lexer
3289a10 improve http lexer
27b4ff3 add http lexer
9401ea9 Expand single and double quote string lexing in mysql, sql, and transactsql lexers

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