Update pytest-runner from 2.11.1 to 3.0

pyup-bot · pyup-bot · commit ec793f3aaa1d · 2018-01-15T18:19:31.000+05:30
diff --git a/requirements_dev.txt b/requirements_dev.txt
@@ -9,4 +9,4 @@ Sphinx==1.6.6
 cryptography==2.1.4
 PyYAML==3.12
 pytest==3.3.2
-pytest-runner==2.11.1
+pytest-runner==3.0
