test_beta_binomial fails on Windows

[MarcoGorelli]

Noticed in #4269

________________ TestScalarParameterSamples.test_beta_binomial ________________

self = <pymc3.tests.test_distributions_random.TestScalarParameterSamples object at 0x00000148EA6B0FC8>

    def test_beta_binomial(self):
        pymc3_random_discrete(
>           pm.BetaBinomial, {"n": Nat, "alpha": Rplus, "beta": Rplus}, ref_rand=self._beta_bin
        )

pymc3\tests\test_distributions_random.py:718: 
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _
pymc3\tests\test_distributions_random.py:100: in pymc3_random_discrete
    e = ref_rand(size=size, **pt)
pymc3\tests\test_distributions_random.py:722: in _beta_bin
    return st.binom.rvs(n, st.beta.rvs(a=alpha, b=beta, size=size))
C:\Miniconda\envs\pymc3-dev-py37\lib\site-packages\scipy\stats\_distn_infrastructure.py:2997: in rvs
    return super(rv_discrete, self).rvs(*args, **kwargs)
C:\Miniconda\envs\pymc3-dev-py37\lib\site-packages\scipy\stats\_distn_infrastructure.py:1004: in rvs
    vals = self._rvs(*args, size=size, random_state=random_state)
C:\Miniconda\envs\pymc3-dev-py37\lib\site-packages\scipy\stats\_discrete_distns.py:41: in _rvs
    return random_state.binomial(n, p, size)
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _

>   ???
E   TypeError: Cannot cast array data from dtype('int64') to dtype('int32') according to the rule 'safe'

mtrand.pyx:3360: TypeError

[ricardoV94]

Closing this, as test no longer exists in V4