Pin pytest to <2.8, there's a bug with deprecation warnings
diff --git a/setup.py b/setup.py
index 444b488..b36f3de 100644
--- a/setup.py
+++ b/setup.py
@@ -57,7 +57,7 @@
 
 # If you add a new dep here you probably need to add it in the tox.ini as well
 test_requirements = [
-    "pytest",
+    "pytest<2.8",
     "pretend",
     "iso8601",
 ]