Misc/NEWS.d/next/Tests/2019-04-26-09-02-49.bpo-36719.ys2uqH.rst

regrtest now always detects uncollectable objects. Previously, the check was
only enabled by ``--findleaks``. The check now also works with
``-jN/--multiprocess N``. ``--findleaks`` becomes a deprecated alias to
``--fail-env-changed``.