adopt warning filter for latest beautifulsoup version

snallygaster

@@ -37,7 +37,9 @@ dns_cache = {}
 
 # This prevents BeautifulSoup from causing warnings when the
 # content of a webpage looks suspicious, i.e. when it only
-# contains a single URL or a filename.
+# contains a single URL or a filename. Since 4.9.1.
+warnings.filterwarnings("ignore", category=bs4.MarkupResemblesLocatorWarning)
+# For BeautifulSoup before 4.9.1, can be removed at some point.
 warnings.filterwarnings("ignore", category=UserWarning, module="bs4")
 # Disable warnings when BeautifulSoup sees an XML document
 warnings.filterwarnings("ignore", category=XMLParsedAsHTMLWarning, module="html.parser")