tox: Update hypothesis to 1.11.1.

Bug fixes:

- When running Hypothesis tests in parallel (e.g. using pytest-xdist) there was
  a race condition caused by code generation.
- Example databases are now cached per thread so as to not use sqlite
  connections from multiple threads. This should make Hypothesis now entirely
  thread safe.
- floats() with only min_value or max_value set would have had a very bad
  distribution.
- Running on 3.5, Hypothesis would have emitted deprecation warnings because of
  use of inspect.getargspec

tox.ini

@@ -21,7 +21,7 @@ deps =
     pytest-qt==1.7.0
     pytest-mock==0.7.0
     pytest-html==1.6
-    hypothesis==1.11.0
+    hypothesis==1.11.1
     hypothesis-pytest==0.18.1
     coverage==3.7.1
     pytest-cov==2.1.0
@@ -78,7 +78,7 @@ deps =
     astroid==1.3.8
     beautifulsoup4==4.4.0
     pylint==1.4.4
-    hypothesis==1.11.0
+    hypothesis==1.11.1
     logilab-common==1.0.2
     six==1.9.0
 commands =