v1.2.0

• updates default bg_temp to 3.77 K
• Updates caribou_hi to bayes_spec>=1.7.0
• Reparameterizes model in terms of pressure and depth
• Changes size-linewidth and n_alpha parameters from cloud-based to hyper parameters
• Removes constant noise assumption from emission + absorption models
• Observed absorption spectra are now 1 - exp(-tau) instead of tau
• Uniform prior on filling factor