Update pytest from 3.8.2 to 3.9.1

pyup-bot · pyup-bot · commit 50ce39881b18 · 2018-10-22T16:26:08.000+03:00
diff --git a/requirements-dev.txt b/requirements-dev.txt
@@ -2,7 +2,7 @@ coverage==4.5.1
 flake8==3.5.0
 ipdb==0.11
 ipython==7.0.1
-pytest==3.8.2
+pytest==3.9.1
 pytest-cov==2.6.0
 pytest-sugar==0.9.1
 PyMySQL>=0.9,<=0.9.2
