species v0.0.9

• resample_spectrum for smoothing a spectrum.
• quantity argument in get_model to either output a flux or magnitude.
• Additional options in add_calibration for importing a calibration spectrum.
• Both field and young/low-gravity objects can be selected with object_type.
• weighting argument in FitModel.
• ReadPlanck for reading a Planck function.
• FitPlanck for fitting photometry and/or a spectrum with MCMC.
• Improved plotting functionalities.
• Many small improvements.
• Several minor bug fixes.
• Updated companion magnitudes and distances.
• Updated and improved documentation.