[requires.io] dependency update

requires · requires · commit d83eed8770f8 · 2018-08-25T05:54:19.000+01:00
diff --git a/test_requirements.txt b/test_requirements.txt
@@ -1,4 +1,4 @@
 pytest==3.7.2
 pytest-cov==2.5.1
-pytest-xdist==1.22.5
+pytest-xdist==1.23.0
 hypothesis
