[requires.io] dependency update

requires · requires · commit 4e20b798e5cf · 2018-08-29T22:11:27.000+01:00
diff --git a/test_requirements.txt b/test_requirements.txt
@@ -1,4 +1,4 @@
-pytest==3.7.3
+pytest==3.7.4
 pytest-cov==2.5.1
 pytest-xdist==1.23.0
 hypothesis
