Merge pull request #208 from python-hyper/dependabot/pip/hypothesis-lt-5.3.1

Update hypothesis requirement from <5.2.2 to <5.3.1

Author: alexwlchan

test_requirements.txt

@@ -1,4 +1,4 @@
 pytest<6
-hypothesis<5.2.2
+hypothesis<5.3.1
 coverage==5.0.3
 attrs==19.3.0