[requires.io] dependency update

requires · requires · commit 2b46348a1e12 · 2018-01-11T21:22:40.000Z
diff --git a/test_requirements.txt b/test_requirements.txt
@@ -1,4 +1,4 @@
 pytest==3.3.2
 pytest-cov==2.5.1
-pytest-xdist==1.21.0
+pytest-xdist==1.22.0
 hypothesis
