fix: correct import for unescape

Surfaced via `mypy`, in that the `html.parser` module does not have
a direct implementation of `unescape`.
Refs: https://docs.python.org/3.6/library/html.html#html.unescape

In pypa#192 support for Python 2.7 was removed, the import path changed.

This works due to imports placing the imported code in the local scope.
If the `html.parser` module ever stopped importing `unescape`,
this import would break as a result.

Signed-off-by: Mike Fiedler <[email protected]>

Author: miketheman

readme_renderer/markdown.py

@@ -16,7 +16,7 @@
 import re
 import warnings
 
-from html.parser import unescape
+from html import unescape
 
 import pygments
 import pygments.lexers