pytest generates deprecation warning for `message` parameter

[satra]

Summary

pytest has deprecated message parameter for checking exceptions. this bloats the testing output for pytest.

Actual behavior

/src/nipype/nipype/algorithms/tests/test_CompCor.py:148

  /src/nipype/nipype/algorithms/tests/test_CompCor.py:148: PytestDeprecationWarning: The 'message' parameter is deprecated.

  (did you mean to use `match='some regex'` to check the exception message?)

  Please comment on https://github.com/pytest-dev/pytest/issues/3974 if you have concerns about removal of this parameter.

    with pytest.raises(ValueError, message='more than one mask file'):

Expected behavior

no warnings from pytest

How to replicate the behavior

current travis tests

Platform details:

travis testing