tox: Update hypothesis to 2.0.0.

2.0.0 - 2016-01-10
------------------

Codename: A new beginning

This release cleans up all of the legacy that accrued in the course of
Hypothesis 1.0. These are mostly things that were emitting deprecation warnings
in 1.19.0, but there were a few additional changes.

In particular:

- non-strategy values will no longer be converted to strategies when used in
  given or find.
- FailedHealthCheck is now an error and not a warning.
- Handling of non-ascii reprs in user types have been simplified by using raw
  strings in more places in Python 2.
- given no longer allows mixing positional and keyword arguments.
- given no longer works with functions with defaults.
- given no longer turns provided arguments into defaults - they will not appear
  in the argspec at all.
- the basic() strategy no longer exists.
- the n_ary_tree strategy no longer exists.
- the average_list_length setting no longer exists. Note: If you're using using
  recursive() this will cause you a significant slow down. You should pass
  explicit average_size parameters to collections in recursive calls.
- @rule can no longer be applied to the same method twice.
- Python 2.6 and 3.3 are no longer officially supported, although in practice
  they still work fine.

This also includes two non-deprecation changes:

- given's keyword arguments no longer have to be the rightmost arguments and
  can appear anywhere in the method signature.
- The max_shrinks setting would sometimes not have been respected.

1.19.0 - 2016-01-09
-------------------

Codename: IT COMES

This release heralds the beginning of a new and terrible age of Hypothesis 2.0.

It's primary purpose is some final deprecations prior to said release. The goal
is that if your code emits no warnings under this release then it will probably
run unchanged under Hypothesis 2.0 (there are some caveats to this: 2.0 will
drop support for some Python versions, and if you're using internal APIs then
as usual that may break without warning).

It does have two new features:

- New @seed() decorator which allows you to manually seed a test. This may be
  harmlessly combined with and overrides the derandomize setting.
- settings objects may now be used as a decorator to fix those settings to a
  particular @given test.

API changes (old usage still works but is deprecated):

- Settings has been renamed to settings (lower casing) in order to make the
  decorator usage more natural.
- Functions for the storage directory that were in hypothesis.settings are now
  in a new hypothesis.configuration module.

Additional deprecations:

- the average_list_length setting has been deprecated in favour of being
  explicit.
- the basic() strategy has been deprecated as it is impossible to support it
  under a Conjecture based model, which will hopefully be implemented at some
  point in the 2.x series.
- the n_ary_tree strategy (which was never actually part of the public API) has
  been deprecated.
- Passing settings or random as keyword arguments to given is deprecated (use
  the new functionality instead)

Bug fixes:

- No longer emit PendingDeprecationWarning for __iter__ and StopIteration in
  streaming() values.
- When running in health check mode with non strict, don't print quite so many
  errors for an exception in reify.
- When an assumption made in a test or a filter is flaky, tests will now raise
  Flaky instead of UnsatisfiedAssumption.

tox.ini

@@ -20,7 +20,7 @@ deps =
     Flask==0.10.1
     glob2==0.4.1
     httpbin==0.4.0
-    hypothesis==1.18.1
+    hypothesis==2.0.0
     itsdangerous==0.24
     Mako==1.0.3
     parse==1.6.6