Features
- Support for supplying an initial dict into `readcim`
- Support for CIM16 using the CIM15 library
- Python 3 support!
- `ACLineSegmentPhase` class added
- `phases` attribute added to `EnergyConsumerPhase`
Bug Fixes
- Translate `"false"` values on boolean fields in XML to Python `False` values
- Restore support for file handles in `cimread`