deprecate scrapy.utils.markup

it was an import-only shim for w3lib.html

scrapy/utils/markup.py

@@ -3,5 +3,12 @@ Transitional module for moving to the w3lib library.
 
 For new code, always import from w3lib.html instead of this module
 """
+import warnings
 
+from scrapy.exceptions import ScrapyDeprecationWarning
 from w3lib.html import *
+
+
+warnings.warn("Module `scrapy.utils.markup` is deprecated. "
+              "Please import from `w3lib.html` instead.",
+              ScrapyDeprecationWarning, stacklevel=2)