Update pytest from 3.6.0 to 3.6.1 (#3614)

requirements/dev.txt

@@ -1,8 +1,8 @@
 # Dependencies needed only for development/testing.
 
-pytest==3.6.0 \
-    --hash=sha256:c76e93f3145a44812955e8d46cdd302d8a45fbfc7bf22be24fe231f9d8d8853a \
-    --hash=sha256:39555d023af3200d004d09e51b4dd9fdd828baa863cded3fd6ba2f29f757ae2d
+pytest==3.6.1 \
+    --hash=sha256:26838b2bc58620e01675485491504c3aa7ee0faf335c37fcd5f8731ca4319591 \
+    --hash=sha256:32c49a69566aa7c333188149ad48b58ac11a426d5352ea3d8f6ce843f88199cb
 
 django-debug-toolbar==1.9.1 \
     --hash=sha256:4af2a4e1e932dadbda197b18585962d4fc20172b4e5a479490bc659fe998864d \