Update version 0.8.4 -> 0.8.5
Update version 0.8.4 -> 0.8.5

New Features
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* `SampleSet.truncate` method

Fixes
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* `BinaryQuadraticModel`s are now pickleable in python2.7
* Some bug fixes and new parameters in `BinaryQuadraticModel.to_serializable`
oneklc/dimod,oneklc/dimod