Update README

README.md

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 # stglib - Process data from a variety of oceanographic instrumentation
 
-[doi:10.5066/P13IQYFW](https://doi.org/10.5066/P13IQYFW)
+Version 1.0.0 of this software was approved for release at [doi:10.5066/P13IQYFW](https://doi.org/10.5066/P13IQYFW). Development continues at https://code.usgs.gov/cmgp/stglib.
 
 This package contains code to process data from a variety of oceanographic instrumentation, consistent with the procedures of the USGS [Coastal/Marine Hazards and Resources Program](https://marine.usgs.gov) (formerly Coastal and Marine Geology Program).
 
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 This package makes heavy use of [NumPy](http://www.numpy.org), [xarray](http://xarray.pydata.org/en/stable/), and [netCDF4](http://unidata.github.io/netcdf4-python/). It works on Python 3.9+.
 
 [Read the documentation](http://stglib.readthedocs.io/).
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+# Suggested Citation
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+Nowacki, D.J., Suttles, S.E., Bales, R.D., De Meo, O.A., 2024, stglib: Oceanographic Time Series Data Processing Library, U.S. Geological Survey software release, [doi:10.5066/P13IQYFW](https://doi.org/10.5066/P13IQYFW).