tests: pass settings of hypothesis by with statement

given(..., settings=) is no longer available in Hypothesis 2.0.0.

https://github.com/DRMacIver/hypothesis/commit/7712c01

tests/hypothesishelpers.py

@@ -33,7 +33,8 b' def check(*args, **kwargs):'
         # Fixed in version 1.13 (released 2015 october 29th)
         f.__module__ = '__anon__'
         try:
-            given(*args, settings=settings(max_examples=2000), **kwargs)(f)()
+            with settings(max_examples=2000):
+                given(*args, **kwargs)(f)()
         except Exception:
             traceback.print_exc(file=sys.stdout)
             sys.exit(1)