Release 0.2.0

New Features:
--------------
- `roof_duality()` now also returns the energy lower bound of the problem BQM. #19

dwave/preprocessing/__init__.py

@@ -12,7 +12,7 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-__version__ = '0.1.2'
+__version__ = '0.2.0'
 
 from dwave.preprocessing import *
 import dwave.preprocessing.composites