++++++++++++++++++
- Added progress bars using `tqdm <https://github.com/tqdm/tqdm>`_.
- Added HDF5 backend using `h5py <http://www.h5py.org/>`_.
- Added new ``Move`` interface for more flexible specification of proposals.
- Improved autocorrelation time estimation algorithm.
- Switched documentation to using Jupyter notebooks for tutorials.
- More details can be found `on the docs <https://emcee.readthedocs.io/en/v3.0.0/user/upgrade/>`_.