Update README.md

Author: DanielVandH

README.md

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 This is a package for simulating epithelial dynamics in one dimension, implementing the model in [Baker et al. (2019)](https://doi.org/10.1016/j.jtbi.2018.12.025). Currently only cell migration and cell proliferation is implemented with no support for cell death. Methods are provided for constructing the corresponding continuum limit problem. Steady states for problems without proliferation can also be computed.