Update pytest version

Shane DeWael · Shane DeWael · commit 5f9f8285d8bf · 2019-01-23T16:20:07.000-08:00
diff --git a/test_requirements.txt b/test_requirements.txt
@@ -1,4 +1,4 @@
-pytest<3.3
+pytest<4
 codecov
 coverage
 mock
