use pathlib2 up to python3.4 - damn the stdlib

src/_pytest/compat.py

@@ -30,11 +30,8 @@ _PY2 = not _PY3
 
 if _PY3:
     from inspect import signature, Parameter as Parameter
-    from pathlib import Path
 else:
     from funcsigs import signature, Parameter as Parameter
-    from pathlib2 import Path
-
 
 NoneType = type(None)
 NOTSET = object()
@@ -43,6 +40,12 @@ PY35 = sys.version_info[:2] >= (3, 5)
 PY36 = sys.version_info[:2] >= (3, 6)
 MODULE_NOT_FOUND_ERROR = "ModuleNotFoundError" if PY36 else "ImportError"
 
+if PY35:
+    from pathlib import Path
+else:
+    from pathlib2 import Path
+
+
 if _PY3:
     from collections.abc import MutableMapping as MappingMixin  # noqa
     from collections.abc import Mapping, Sequence  # noqa