Hotfix add htmlcov to FlatLayoutPackageFinder.DEFAULT_EXCLUDE

Author: yukihiko-shinoda

setuptools/discovery.py

@@ -234,6 +234,7 @@ class FlatLayoutPackageFinder(PEP420PackageFinder):
         "benchmarks",
         "exercise",
         "exercises",
+        "htmlcov",  # Coverage.py
         # ---- Hidden directories/Private packages ----
         "[._]*",
     )
@@ -273,7 +274,7 @@ class FlatLayoutModuleFinder(ModuleFinder):
         "benchmarks",
         "exercise",
         "exercises",
-        "htmlcov",
+        "htmlcov",  # Coverage.py
         # ---- Hidden files/Private modules ----
         "[._]*",
     )