Log Message:
py-beautifulsoup4: update to 4.9.0

4.9.0 (20200405)

* Added PageElement.decomposed, a new property which lets you
  check whether you've already called decompose() on a Tag or
  NavigableString.

* Embedded CSS and Javascript is now stored in distinct Stylesheet and
  Script tags, which are ignored by methods like get_text(). This
  feature is not supported by the html5lib treebuilder. [bug=1868861]

* Added a Russian translation by 'authoress' to the repository.

* Fixed an unhandled exception when formatting a Tag that had been
  decomposed.[bug=1857767]

* Fixed a bug that happened when passing a Unicode filename containing
  non-ASCII characters as markup into Beautiful Soup, on a system that
  allows Unicode filenames. [bug=1866717]

* Added a performance optimization to PageElement.extract(). Patch by
  Arthur Darcet.