Remove pathlib2 compatibility code.

Author: nezhar

jsonschema/tests/_suite.py

@@ -3,18 +3,14 @@
 """
 
 from functools import partial
+from pathlib import Path
 import json
 import os
 import re
 import subprocess
 import sys
 import unittest
 
-try:
-    from pathlib import Path
-except ImportError:
-    from pathlib2 import Path
-
 import attr
 
 from jsonschema.validators import validators