Update README.md [skip ci]

Author: t-sommer

README.md

@@ -20,11 +20,11 @@ The SDF library ships with [Dymola](https://www.3ds.com/products/catia/dymola) a
 
 ## License
 
-Copyright (c) 2025 Dassault Systèmes.
+Copyright © 2025 Dassault Systèmes.
 The code is released under the [2-Clause BSD license](LICENSE.txt).
 
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 <p align="center">
     <a href="https://3ds.com/"><img src="SDF/Resources/Images/made-by-3ds.svg"/></a>
-</p>
+</p>