tox: Update hypothesis to 1.14.0.

New features:

* Add 'note' function which lets you include additional information in the
  final test run's output.
* Add 'choices' strategy which gives you a choice function that emulates
  random.choice.
* Add 'uuid' strategy that generates UUIDs'
* Add 'shared' strategy that lets you create a strategy that just generates a
  single shared value for each test run

Bugs:

* Using strategies of the form streaming(x.flatmap(f)) with find or in stateful
  testing would have caused InvalidArgument errors when the resulting values
  were used (because code that expected to only be called within a test context
  would be invoked).

tox.ini

@@ -25,7 +25,7 @@ deps =
     pytest-sugar==0.5.1
     pytest-travis-fold==1.1.1
     xvfbwrapper==0.2.5
-    hypothesis==1.13.0
+    hypothesis==1.14.0
     coverage==4.0.1
     pytest-cov==2.2.0
     beautifulsoup4==4.4.1