Opower

What's Changed
* Enmax: improve error handling by aman207 in https://github.com/tronikos/opower/pull/89
* Add Support for Mercury NZ Limited by SplicedNZ in https://github.com/tronikos/opower/pull/87

New Contributors
* SplicedNZ made their first contribution in https://github.com/tronikos/opower/pull/87

**Full Changelog**: https://github.com/tronikos/opower/compare/v0.5.2...v0.6.0

- [Add HALF_HOUR and QUARTER_HOUR](https://github.com/tronikos/opower/commit/bcb62c5744ac9408486706c4520c5639639d1c93)
- [Add csv arg](https://github.com/tronikos/opower/commit/6a96b931a7a5b8d1200e298c283d7b31cc681037)
- [Rename demo.py to __main__.py](https://github.com/tronikos/opower/commit/6cd65cea678da2b7c5cb3b04dd314765ccd790ee)

- [skip forecasts without an account uuid](https://github.com/tronikos/opower/commit/d0e8a7e270718ae98a7920ec609bcb32a3dacd26)

- [Use aiozoneinfo](https://github.com/tronikos/opower/commit/6a9d44c72e06ce161ec6027a393fa6cb751a2612) for https://github.com/home-assistant/core/issues/118406