Mendeleev

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* [ENH] Add data export to various formats by :user:`lmmentel` in :pr:`151`
* [ENH] Create metadata table for stored properties by :user:`lmmentel` in :pr:`156`
* [ENH] Update Isotope.half_life_unit values by :user:`lmmentel` in :pr:`160`
* [DOC] Add section for alternative implementation of mendeleev to README by :user:`lmmentel` in :pr:`163`
* [DOC] Add Mendeleev.jl to README by :user:`lmmentel` in :pr:`164`
* [FIX] Use read-only SQLite connection by :user:`jan-janssen` in :pr:`165`
* [FIX] Fix fetch_table to be compatible across major versions of pandas and sqlalchemy by :user:`lmmentel` in :pr:`159`

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* * Fix ``ImportError`` not being raised with missing objects by :user:`lmmentel` in :pr:`150`

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* [FIX] Fix import error by :user:`lmmentel` in :pr:`148`

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* [ENH] Adopt ruff and pre-commit for linting and formatting by :user:`lmmentel` in :pr:`139`
* [ENH] Improve element not found by :user:`Vi-L` in :pr:`142`
* [ENH] Defer loading element data until attribute access by :user:`paulromano` in :pr:`121`

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* [FIX] Fix a few issues with README.md by :user:`paulromano` in :pr:`119`
* [MNT] Remove six dependency by :user:`paulromano` in :pr:`120`
* [FIX] Update abundance for 126Te isotope by :user:`lmmentel` in :pr:`123`
* [MNT] add python 3.12 support and bump various package versions :user:`lmmentel` in :pr:`134`

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* Fix Mulliken electronegativity by :user:`lmmentel` in :pr:`116`
* [FIX] Enable fetch of phase transition data by :user:`lmmentel` in :pr:`112`