Merge pull request #264 from ClearcodeHQ/requires-io-master

[requires.io] dependency update on master branch

setup.py

@@ -31,7 +31,7 @@
 ]
 
 tests_require = (
-    'pytest==3.10.1',  # tests framework used
+    'pytest==4.0.0',  # tests framework used
     'pytest-cov==2.6.0',  # coverage reports to verify tests quality
     'mock==2.0.0',  # tests mocking tool
     'python-daemon==2.2.0',  # used in test for easy creation of daemons