CI test suite fails after meteor metric update

## Describe the bug
CI test suite fails: https://app.circleci.com/pipelines/github/huggingface/datasets/8110/workflows/f059ba43-9154-4632-bebb-82318447ddc9/jobs/50010

Stack trace:
```
___________________ LocalMetricTest.test_load_metric_meteor ____________________
[gw1] linux -- Python 3.6.15 /home/circleci/.pyenv/versions/3.6.15/bin/python3.6

self = <tests.test_metric_common.LocalMetricTest testMethod=test_load_metric_meteor>
metric_name = 'meteor'

    def test_load_metric(self, metric_name):
        doctest.ELLIPSIS_MARKER = "[...]"
        metric_module = importlib.import_module(datasets.load.prepare_module(os.path.join("metrics", metric_name))[0])
        metric = datasets.load.import_main_class(metric_module.__name__, dataset=False)
        # check parameters
        parameters = inspect.signature(metric._compute).parameters
        self.assertTrue("predictions" in parameters)
        self.assertTrue("references" in parameters)
        self.assertTrue(all([p.kind != p.VAR_KEYWORD for p in parameters.values()]))  # no **kwargs
        # run doctest
        with self.patch_intensive_calls(metric_name, metric_module.__name__):
            with self.use_local_metrics():
>               results = doctest.testmod(metric_module, verbose=True, raise_on_error=True)

tests/test_metric_common.py:75: 
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 
../.pyenv/versions/3.6.15/lib/python3.6/doctest.py:1951: in testmod
    runner.run(test)
../.pyenv/versions/3.6.15/lib/python3.6/doctest.py:1839: in run
    r = DocTestRunner.run(self, test, compileflags, out, False)
../.pyenv/versions/3.6.15/lib/python3.6/doctest.py:1476: in run
    return self.__run(test, compileflags, out)
../.pyenv/versions/3.6.15/lib/python3.6/doctest.py:1382: in __run
    exception)
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 

self = <doctest.DebugRunner object at 0x7f4c26bd3da0>
out = <built-in method write of _io.TextIOWrapper object at 0x7f51a21852d0>
test = <DocTest datasets_modules.datasets.meteor.6201bb45d2c144ea7963680949d20f523d74a741fa0f8a806f836e6caa5245d7.meteor.Mete...ets_modules/datasets/meteor/6201bb45d2c144ea7963680949d20f523d74a741fa0f8a806f836e6caa5245d7/meteor.py:87 (5 examples)>
example = <doctest.Example object at 0x7f4c26bd3eb8>
exc_info = (<class 'TypeError'>, TypeError('"hypothesis" expects pre-tokenized hypothesis (Iterable[str]): It is a guide to action which ensures that the military always obeys the commands of the party',), <traceback object at 0x7f4cd01afec8>)

    def report_unexpected_exception(self, out, test, example, exc_info):
>       raise UnexpectedException(test, example, exc_info)
E       doctest.UnexpectedException: <DocTest datasets_modules.datasets.meteor.6201bb45d2c144ea7963680949d20f523d74a741fa0f8a806f836e6caa5245d7.meteor.Meteor from /tmp/pytest-of-circleci/pytest-0/popen-gw1/cache/modules/datasets_modules/datasets/meteor/6201bb45d2c144ea7963680949d20f523d74a741fa0f8a806f836e6caa5245d7/meteor.py:87 (5 examples)>

../.pyenv/versions/3.6.15/lib/python3.6/doctest.py:1845: UnexpectedException
```