Update version 0.8.12 -> 0.8.13

New Features
------------
* `TrackingComposite`, a new composite that records inputs and outputs for testing
* `NullSampler`, a new sampler that always returns an empty sample set
* `child_structure_dfs` function that searches child samplers for a structured
* `HigherOrderComposite` now supports the `initial_state` keyword argument
* `BinaryQuadraticModel.is_writeable` flag that toggles whether the BQM is treated as immutable or not
* `SampleSet.is_writeable` flag that toggles whether the sample set is treated as immutable or not

dimod/package_info.py

@@ -14,7 +14,7 @@
 #
 # ================================================================================================
 
-__version__ = '0.8.12'
+__version__ = '0.8.13'
 __author__ = 'D-Wave Systems Inc.'
 __authoremail__ = 'acondello@dwavesys.com'
 __description__ = 'A shared API for binary quadratic model samplers.'