Update version 0.8.3 -> 0.8.4
Update version 0.8.3 -> 0.8.4

New Features
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* `assert_bqm_almost_equal` function for testing
* `ScaleComposite`
* `sample_column` optional keyword argument for `SampleSet.to_pandas_df`
* `sample_dict_cast` optional keyword argument for `SampleSet.data`

Fixes
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* `BQM.normalize` now ignored ignored variables/interactions when determining scale
oneklc/dimod,oneklc/dimod