Update README.md

README.md

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 # **Simscape Multibody Parts Library**
 Copyright 2017-2020 The MathWorks(TM), Inc.
 
+[![View Simscape Multibody Parts Library on File Exchange](https://www.mathworks.com/matlabcentral/images/matlab-file-exchange.svg)](https://www.mathworks.com/matlabcentral/fileexchange/36536-simscape-multibody-parts-library)
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 This set of examples shows you how to create parameterized parts for Simscape Multibody
 and example MATLAB scripts for defining general extrusions.  The parts have been used in a 
 wide range of examples to show how these blocks enable you to rapidly model mechanisms.
@@ -16,6 +18,11 @@ the required blocks together and parameterize them so that frames are always in
 There are many ways they can be combined, this library shows you one way to do it.
 
 ### **Release History** 
+**v4.0 Sep 2020** (R2019b - R2020b)
+1. Updated for R2020b
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+**v4.0 Mar 2020** (R2019b - R2020a)
+1. Updated for R2020a
 
 **v4.0 Sep 2019** (R2019b)
 1. Converted library for use with MATLAB Projects.