Bug on ensemble.py

[dkn16]

Describe the bug:

When calling the function EnsembleSampler.init, always throw an error with 'got an unexpected keyword argument dim'
To Reproduce:
Steps to reproduce the behavior:

1. call run_mcmc and one can see the error

Expected behavior:

I guess the self.dim in ensemble.py should be self.ndim.
Details:

• OS: CentOS 7.9.2009
• Python Version: 3.8
• Relevant compiler versions:
• Relevant package versions: emcee 3.0.2

Additional context

[steven-murray]

Thanks @dkn16. I'll make sure I fix this today.