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This is a yak shaving release, mostly concerned with our own tests.
While :func:`~python:inspect.getfullargspec` was documented as deprecated
in Python 3.5, it never actually emitted a warning. Our code to silence
this (nonexistent) warning has therefore been removed.
We now run our tests with ``DeprecationWarning`` as an error, and made some
minor changes to our own tests as a result. This required similar upstream
updates to :pypi:`coverage` and :pypi:`execnet` (a test-time dependency via
:pypi:`pytest-xdist`).
There is no user-visible change in Hypothesis itself, but we encourage you
to consider enabling deprecations as errors in your own tests.