[requires.io] dependency update

requires · requires · commit 37439d524581 · 2017-08-26T07:00:41.000-05:00
diff --git a/test_requirements.txt b/test_requirements.txt
@@ -1,4 +1,4 @@
 pytest==3.2.1
 pytest-cov==2.5.1
 pytest-xdist==1.20.0
-hypothesis==3.21.2
+hypothesis==3.21.3
