remove python 2.7 stuff

requirements/test.txt

@@ -1,4 +1,3 @@
-mock; python_version < '3'
 pytest
 pytest-cov
 pytest-sugar

setup.py

@@ -1,10 +1,10 @@
-import sys
 from distutils.core import setup
 
 from setuptools import find_packages
 
 import about_time
 
+
 def get_readme():
     with open('README.md', encoding='utf-8') as readme_file:
         return readme_file.read()

tests/test_core.py

@@ -1,15 +1,8 @@
-# coding=utf-8
-from __future__ import absolute_import, division, unicode_literals
-
 import random
 from datetime import datetime
 from decimal import Decimal
 from itertools import chain, repeat, tee
-
-try:
-    from unittest import mock
-except ImportError:
-    import mock
+from unittest import mock
 
 import pytest