upgrade version to 2.0.0

Author: maximilionus

python_docs_dark.user.css

@@ -4,7 +4,7 @@
 @homepageURL    https://github.com/maximilionus/python_docs_dark
 @updateURL      https://github.com/maximilionus/python_docs_dark/raw/master/python_docs_dark.user.css
 @license        MIT
-@version        1.1.0
+@version        2.0.0
 @description    Dark theme for docs.python.org
 @author         maximilionus <maximilionuss@gmail.com>
 ==/UserStyle== */