Citylearn

What's Changed
* update by kingsleynweye in https://github.com/intelligent-environments-lab/CityLearn/pull/92
* Citylearn challenge 2023 power outage env by kingsleynweye in https://github.com/intelligent-environments-lab/CityLearn/pull/93


**Full Changelog**: https://github.com/intelligent-environments-lab/CityLearn/compare/v2.1b11...v2.1b12

What's Changed
* Storage bug fixes by kingsleynweye in https://github.com/intelligent-environments-lab/CityLearn/pull/91


**Full Changelog**: https://github.com/intelligent-environments-lab/CityLearn/compare/v2.1b10...v2.1b11

What's Changed
* fix: simple change to avoid division by zero in unserved_energy calc by callumtilbury in https://github.com/intelligent-environments-lab/CityLearn/pull/89
* Citylearn challenge 2023 power outage env by kingsleynweye in https://github.com/intelligent-environments-lab/CityLearn/pull/90

New Contributors
* callumtilbury made their first contribution in https://github.com/intelligent-environments-lab/CityLearn/pull/89

**Full Changelog**: https://github.com/intelligent-environments-lab/CityLearn/compare/v2.1b9...v2.1b10

What's Changed
* Citylearn challenge 2023 power outage env by kingsleynweye in https://github.com/intelligent-environments-lab/CityLearn/pull/86


**Full Changelog**: https://github.com/intelligent-environments-lab/CityLearn/compare/v2.1b8...v2.1b9

What's Changed
* Update dev branch with master by kingsleynweye in https://github.com/intelligent-environments-lab/CityLearn/pull/83
* Citylearn challenge 2023 power outage env by kingsleynweye in https://github.com/intelligent-environments-lab/CityLearn/pull/84


**Full Changelog**: https://github.com/intelligent-environments-lab/CityLearn/compare/v2.1b7...v2.1b8

**Full Changelog**: https://github.com/intelligent-environments-lab/CityLearn/compare/v2.1b6...v2.1b7