Update the note about origins of the CssSelector component.
Update the note about origins of the CssSelector component.

The last rewrite is based on the cssselect which is no longer part of lxml, but was extracted as an independent library.

oswaldderiemaecker/CssSelector,symfony/CssSelector,symfony/css-selector,symfony/css-selector,symfony/CssSelector,oswaldderiemaecker/CssSelector