Update README.md

Fix link to File Exchange to avoid redirect

Author: eszmw

README.md

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 # Descriptive Statistics and Probability Distributions 
-[![View Descriptive Statistics and Probability Distributions on File Exchange](https://www.mathworks.com/matlabcentral/images/matlab-file-exchange.svg)](https://www.mathworks.com/matlabcentral/fileexchange/95463-descriptive-stats-and-probability) 
+[![View Descriptive Statistics and Probability Distributions on File Exchange](https://www.mathworks.com/matlabcentral/images/matlab-file-exchange.svg)](https://www.mathworks.com/matlabcentral/fileexchange/95463-descriptive-statistics-and-probability-distributions) 
 or [![Open in MATLAB Online](https://www.mathworks.com/images/responsive/global/open-in-matlab-online.svg)](https://matlab.mathworks.com/open/github/v1?repo=MathWorks-Teaching-Resources/Descriptive-Stats-and-Probability&project=StatsAndProb.prj)
 
 **Curriculum Module in collaboration with Ward Nickle, Humboldt State University**