[requires.io] dependency update

requires · requires · commit f2206213df9b · 2017-08-22T12:43:49.000-05:00
diff --git a/test_requirements.txt b/test_requirements.txt
@@ -1,3 +1,3 @@
 pytest==3.2.1
 pytest-cov==2.5.1
-hypothesis==3.19.3
+hypothesis==3.20.0
