Update pytest from 3.5.1 to 3.6.1

pyup-bot · pyup-bot · commit 110a15df0e20 · 2018-06-06T08:04:06.000+02:00
diff --git a/requirements_dev.txt b/requirements_dev.txt
@@ -6,7 +6,7 @@ flake8==3.5.0
 tox==3.0.0
 coverage==4.5.1
 Sphinx==1.7.5
-pytest==3.5.1
+pytest==3.6.1
 pytest-runner==4.2
 faker==0.8.15
 pandas==0.23.0
