Merge pull request #1563 from alhirzel/master

Change find_module to find_spec for py37 compat

changelog.d/1563.change.rst

+In ``pkg_resources`` prefer ``find_spec`` (PEP 451) to ``find_module``.

pkg_resources/__init__.py

@@ -2197,6 +2197,10 @@ def _handle_ns(packageName, path_item):
     if importer is None:
         return None
 
+    # use find_spec (PEP 451) and fall-back to find_module (PEP 302)
+    try:
+        loader = importer.find_spec(packageName).loader
+    except AttributeError:
         # capture warnings due to #1111
         with warnings.catch_warnings():
             warnings.simplefilter("ignore")