Error when using latest version of emcee package

[respiewak]

The latest version of the emcee package (version 3.0.1) changed the output of emcee.EnsembleSampler.run_mcmc(), so the following line raises a ValueError:

        pos, prob, state = sampler.run_mcmc(p0, ninit)

This can possibly simply be fixed by adding a fourth variable: pos, prob, _, state = sample.run_mcmc(p0, ninit). I haven't checked if that accounts for all possible cases.