py35: support for fspath(pathlib.Path())

dvc/utils/compat.py

@@ -207,6 +207,12 @@ except ImportError:
         except AttributeError:
             if hasattr(path_type, "__fspath__"):
                 raise
+
+            # Support for pathlib.Path in Python 3.5, since it doesn't
+            # implement `__fspath__`
+            if isinstance(path, pathlib.Path):
+                return str(path)
+
             else:
                 raise TypeError(
                     "expected str, bytes or os.PathLike object, "