py-beautifulsoup4: updated to 4.7.0

4.7.0:

* Beautiful Soup's CSS Selector implementation has been replaced by a
  dependency on Isaac Muse's SoupSieve project (the soupsieve package
  on PyPI). The good news is that SoupSieve has a much more robust and
  complete implementation of CSS selectors, resolving a large number
  of longstanding issues. The bad news is that from this point onward,
  SoupSieve must be installed if you want to use the select() method.

  You don't have to change anything lf you installed Beautiful Soup
  through pip (SoupSieve will be automatically installed when you
  upgrade Beautiful Soup) or if you don't use CSS selectors from
  within Beautiful Soup.

  SoupSieve documentation: https://facelessuser.github.io/soupsieve/

* Fix a number of problems with the tree builder that caused
  trees that were superficially okay, but which fell apart when bits
  were extracted.

* Fixed a problem with the tree builder in which elements that
  contained no content (such as empty comments and all-whitespace
  elements) were not being treated as part of the tree.

* Fixed a problem with multi-valued attributes where the value
  contained whitespace.

* Clarified ambiguous license statements in the source code. Beautiful
  Soup is released under the MIT license, and has been since 4.4.0.

* This file has been renamed from NEWS.txt to CHANGELOG.


(adam)