clarify state of package

README.md

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 [![Aqua QA](https://raw.githubusercontent.com/JuliaTesting/Aqua.jl/master/badge.svg)](https://github.com/JuliaTesting/Aqua.jl)
 
 # StarFormationHistories.jl
-This package implements methods for modelling observed color-magnitude diagrams (CMDs) and using them to fit astrophysical star formation histories (SFHs). A paper describing the implemented methodologies is currently in preparation. This package also provides utilities for simulating CMDs given input SFHs and photometric error and completeness functions, which can be useful for planning observations and writing proposals. Please see our documentation (linked in the badge above) for more information. A rendered Jupyter notebook with example usage of this package is available [here](https://nbviewer.org/github/cgarling/StarFormationHistories.jl/blob/main/examples/fitting1.ipynb). 
+This package implements methods for modelling observed color-magnitude diagrams (CMDs) and using them to fit astrophysical star formation histories (SFHs). A paper describing the implemented methodologies is currently in preparation. This package also provides utilities for simulating CMDs given input SFHs and photometric error and completeness functions, which can be useful for planning observations and writing proposals. Please see our documentation (linked in the badge above) for more information. A rendered Jupyter notebook with example usage of this package is available [here](https://nbviewer.org/github/cgarling/StarFormationHistories.jl/blob/main/examples/fitting1.ipynb).
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+This package is currently considered pre-release and is not yet registered to the general registry. It will be registered upon completion of the associated journal paper.
 
 ## Acknowledgements
 Support for this work was provided by the Owens Family Foundation and by NASA through grant HST-AR-17560 from the Space Telescope Science Institute, which is operated by AURA, Inc., under NASA contract NAS5-26555.