[requires.io] dependency update

requires · requires · commit 7e36dea69658 · 2018-07-28T18:13:33.000+01:00
diff --git a/test_requirements.txt b/test_requirements.txt
@@ -1,4 +1,4 @@
-pytest==3.6.3
+pytest==3.6.4
 pytest-cov==2.5.1
 pytest-xdist==1.22.5
 hypothesis
