mpat 0.2.0

0.2.0

• The generated drift tests are now collected by a pytest plugin. Installing
  mpat is enough: a project with [tool.mpat] in its pyproject.toml gets
  mpat::drift[...] and mpat::still-needed[...] items in its normal pytest
  run, with no test module to write. A project with no [tool.mpat] collects
  nothing.
• The generated items are collected by pytest and by pytest <dir>. An
  argument that names a file or a nodeid selects only what it names, since items
  that belong to no file cannot be narrowed by a path.
• Fixed: collecting the generated tests imports your patch modules normally, so
  the patches apply and later tests in the session see patched behaviour.
  Previously both the plugin and mpat.testing imported them in the collect-only
  mode the CLI uses, which cached them unpatched and made a suite pass or fail
  depending on file order.
• New --no-mpat flag, and a mpat = false ini option, to turn the generated
  items off.
• from mpat.testing import test_upstream_drift, test_patch_still_needed keeps
  working. When that module is collected, the plugin adds nothing, so the checks
  never run twice.