This release supports a more modern configuration using pyproject.toml, adds averages for M31 and M33, and improves internal functionality. What's Changed updating DOI info by @karllark in https://github.com/karllark/dust_extinction/pull/233 updating conda badge by @karllark in https://github.com/karllark/dust_extinction/pull/234 Fix small typo. by @ivastar in https://github.com/karllark/dust_extinction/pull/235 Update citation for published JOSS paper by @karllark in https://github.com/karllark/dust_extinction/pull/236 Add SpectralUnitsWarning for more targeted warning filters by @lpsinger in https://github.com/karllark/dust_extinction/pull/239 Move input unit conversion and bounds checking to base class by @lpsinger in https://github.com/karllark/dust_extinction/pull/240 Update spline interpolation by @karllark in https://github.com/karllark/dust_extinction/pull/245 adding option for FM90_B3 to FM99_method by @karllark in https://github.com/karllark/dust_extinction/pull/246 updating G21 defaults based on G23 fits by @karllark in https://github.com/karllark/dust_extinction/pull/248 Add in M31 Average by @karllark in https://github.com/karllark/dust_extinction/pull/253 Updates to setuptools-scm breaks dust_extinction install by @WillJRoper in https://github.com/karllark/dust_extinction/pull/255 functioning with new pyproject.toml by @karllark in https://github.com/karllark/dust_extinction/pull/256 Add in M33 Average by @karllark in https://github.com/karllark/dust_extinction/pull/257 New Contributors @ivastar made their first contribution in https://github.com/karllark/dust_extinction/pull/235 @lpsinger made their first contribution in https://github.com/karllark/dust_extinction/pull/239 @WillJRoper made their first contribution in https://github.com/karllark/dust_extinction/pull/255 Full Changelog: https://github.com/karllark/dust_extinction/compare/v1.5...v1.6

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