PowerGenome/PowerGenome: v0.5.4

This version bump adds a feature to include user fuels and fixes a number of bugs.

• Add the option for users to define/assign their own fuels
• New option for atb_modifiers and modified_gen_atb to directly set parameter values rather than using a python operator
• Don't force retirement based on age if not specified in settings.
• Don't retire units unless there is a retirement year before the planning period year -- this is a change from previous behavior, where only units with retirement after the planning year would be kept
• Add new check for GenX model tags
• Update example system settings file based on results of check for model tags
• Expand testing

• Fix fuel name bug through eia/atb tech map by @gschivley in https://github.com/PowerGenome/PowerGenome/pull/158
• Check resource tags by @gschivley in https://github.com/PowerGenome/PowerGenome/pull/159
• Add option for user fuels and prices by @gschivley in https://github.com/PowerGenome/PowerGenome/pull/163
• Updating nrelatb.py by @xuqingyu in https://github.com/PowerGenome/PowerGenome/pull/162
• Update GenX.py by @xuqingyu in https://github.com/PowerGenome/PowerGenome/pull/167
• Adjust code to match heat rate table with cost_case column by @gschivley in https://github.com/PowerGenome/PowerGenome/pull/166
• Format Python code with psf/black push by @github-actions in https://github.com/PowerGenome/PowerGenome/pull/170
• User fuels, better tests, don't force age retirement, bug fixes by @gschivley in https://github.com/PowerGenome/PowerGenome/pull/169

• @github-actions made their first contribution in https://github.com/PowerGenome/PowerGenome/pull/170

Full Changelog: https://github.com/PowerGenome/PowerGenome/compare/v0.5.3...v0.5.4