mportError while loading conftest '/home/alexandrufazakas/Documents/buildstream/tests/conftest.py'.
tests/conftest.py:26: in <module>
    from buildstream.testing import register_repo_kind, sourcetests_collection_hook
src/buildstream/testing/__init__.py:26: in <module>
    from .runcli import cli, cli_integration, cli_remote_execution
src/buildstream/testing/runcli.py:53: in <module>
    from buildstream._frontend import cli as bst_cli
src/buildstream/_frontend/__init__.py:20: in <module>
    from .cli import cli
src/buildstream/_frontend/cli.py:318: in <module>
    @click.pass_obj
.tox/py35/lib/python3.5/site-packages/click/decorators.py:151: in decorator
    _param_memo(f, ArgumentClass(param_decls, **attrs))
.tox/py35/lib/python3.5/site-packages/click/core.py:1808: in __init__
    Parameter.__init__(self, param_decls, required=required, **attrs)
E   TypeError: __init__() got an unexpected keyword argument 'help'
ERROR: InvocationError for command /home/alexandrufazakas/Documents/buildstream/.tox/py35/bin/pytest --basetemp .tox/py35/tmp --cov=buildstream --cov-config .coveragerc (exited with code 4)