[pkg] use beautifulsoup4 instead of bs4

__pkginfo__.py

@@ -17,7 +17,7 @@
                'cwtags': None,
                'elasticsearch': '>=2.0.0,<3.0.0',
                'elasticsearch-dsl': '<5.0.0',
-               'bs4': None,
+               'beautifulsoup4': None,
 }
 __recommends__ = {}