Update beautifulsoup4 to 4.6.1

[pyup-bot]

This PR updates beautifulsoup4 from 4.4.1 to 4.6.1.

Changelog

4.6.0

* Added the `Tag.get_attribute_list` method, which acts like `Tag.get` for
getting the value of an attribute, but which always returns a list,
whether or not the attribute is a multi-value attribute. [bug=1678589]

* It's now possible to use a tag's namespace prefix when searching,
e.g. soup.find('namespace:tag') [bug=1655332]

* Improved the handling of empty-element tags like <br> when using the
html.parser parser. [bug=1676935]

* HTML parsers treat all HTML4 and HTML5 empty element tags (aka void
element tags) correctly. [bug=1656909]

* Namespace prefix is preserved when an XML tag is copied. Thanks
to Vikas for a patch and test. [bug=1685172]

4.5.3

* Fixed foster parenting when html5lib is the tree builder. Thanks to
Geoffrey Sneddon for a patch and test.

* Fixed yet another problem that caused the html5lib tree builder to
create a disconnected parse tree. [bug=1629825]

4.5.2

* Apart from the version number, this release is identical to
4.5.3. Due to user error, it could not be completely uploaded to
PyPI. Use 4.5.3 instead.

4.5.1

* Fixed a crash when passing Unicode markup that contained a
processing instruction into the lxml HTML parser on Python
3. [bug=1608048]

4.5.0

* Beautiful Soup is no longer compatible with Python 2.6. This
actually happened a few releases ago, but it's now official.

* Beautiful Soup will now work with versions of html5lib greater than
0.99999999. [bug=1603299]

* If a search against each individual value of a multi-valued
attribute fails, the search will be run one final time against the
complete attribute value considered as a single string. That is, if
a tag has class="foo bar" and neither "foo" nor "bar" matches, but
"foo bar" does, the tag is now considered a match.

This happened in previous versions, but only when the value being
searched for was a string. Now it also works when that value is
a regular expression, a list of strings, etc. [bug=1476868]

* Fixed a bug that deranged the tree when a whitespace element was
reparented into a tag that contained an identical whitespace
element. [bug=1505351]

* Added support for CSS selector values that contain quoted spaces,
such as tag[style="display: foo"]. [bug=1540588]

* Corrected handling of XML processing instructions. [bug=1504393]

* Corrected an encoding error that happened when a BeautifulSoup
object was copied. [bug=1554439]

* The contents of <textarea> tags will no longer be modified when the
tree is prettified. [bug=1555829]

* When a BeautifulSoup object is pickled but its tree builder cannot
be pickled, its .builder attribute is set to None instead of being
destroyed. This avoids a performance problem once the object is
unpickled. [bug=1523629]

* Specify the file and line number when warning about a
BeautifulSoup object being instantiated without a parser being
specified. [bug=1574647]

* The `limit` argument to `select()` now works correctly, though it's
not implemented very efficiently. [bug=1520530]

* Fixed a Python 3 ByteWarning when a URL was passed in as though it
were markup. Thanks to James Salter for a patch and
test. [bug=1533762]

* We don't run the check for a filename passed in as markup if the
'filename' contains a less-than character; the less-than character
indicates it's most likely a very small document. [bug=1577864]

Links

• PyPI: https://pypi.org/project/beautifulsoup4
• Changelog: https://pyup.io/changelogs/beautifulsoup4/
• Homepage: http://www.crummy.com/software/BeautifulSoup/bs4/

[pyup-bot]

Closing this in favor of #133