Update attribution on README

README.md

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     <em>Sea level rise and extreme value analysis for Boston tide gauge using IPCC AR6 projections</em>
 </p>
 
+<p>
+<sub>Cover image credit: "Boston Harbor, Sunset" by Fitz Henry Lane</sub>
+</p>
+
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 Python implementation of the sea level and storm surge analysis found in Lempert et al. (2012) and [Oddo et al. (2017)](https://onlinelibrary.wiley.com/doi/full/10.1111/risa.12888). Generates sea level rise scenarios consistent with projections from Chapter 9 of Working Group 1 contribution to the Intergovernmental Panel on Climate Change (IPCC) Sixth Assessment Report. Performs generalized extreme value (GEV) analysis on Boston tide records using annual block maxima approach and Markov Chain Monte Carlo (MCMC).
 
 Original R code authors:
-- [Klaus Keller ](https://personal.ems.psu.edu/~kzk10/)
+- [Klaus Keller](https://engineering.dartmouth.edu/community/faculty/klaus-keller)
 - [Ryan Sriver](https://atmos.illinois.edu/directory/profile/rsriver)
 
 ## Installation