[requires.io] dependency update

requires · requires · commit 208926b111de · 2018-09-06T06:31:56.000-07:00
diff --git a/test_requirements.txt b/test_requirements.txt
@@ -1,4 +1,4 @@
-pytest==3.7.4
+pytest==3.8.0
 pytest-cov==2.6.0
 pytest-xdist==1.23.0
 hypothesis
