FutureWarning: rcond parameter

[andrewfowlie]

/CosmoTransitions/cosmoTransitions/pathDeformation.py:303: FutureWarning: `rcond` parameter will change to the default of machine precision times ``max(M, N)`` where M and N are the input matrix dimensions.
To use the future default and silence this warning we advise to pass `rcond=None`, to keep using the old, explicitly pass `rcond=-1`.
  self._beta, residues, rank, s = np.linalg.lstsq(self._X, phi)

This is for numpy.__version__ '1.15.1'. Should be easy to silence, might push it later, as there are only two instances,

https://github.com/clwainwright/CosmoTransitions/search?q=np.linalg.lstsq&unscoped_q=np.linalg.lstsq