Add changelog (stylelint#20)

* Add changelog

* Add latest entry

Author: jeddy3

CHANGELOG.md

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+# Changelog
+
+## Head
+
+- Fixed: babel configuration conflict when using TypeScript ([#2](https://github.com/stylelint/stylelint/pull/2)).
+- Fixed: parsing/stringifying for nested tagged template literals ([#17](https://github.com/stylelint/stylelint/pull/17)).
+
+## Previous changes
+
+See [postcss-jsx releases](https://github.com/gucong3000/postcss-jsx/releases).