Update pytest from 2.9.2 to 3.3.2

pyup-bot · pyup-bot · commit 41132d57abbe · 2018-01-15T18:19:30.000+05:30
diff --git a/requirements_dev.txt b/requirements_dev.txt
@@ -8,5 +8,5 @@ coverage==4.4.2
 Sphinx==1.6.6
 cryptography==2.1.4
 PyYAML==3.12
-pytest==2.9.2
+pytest==3.3.2
 pytest-runner==2.11.1
