Update README.md

Author: ThunderMat

README.md

@@ -9,7 +9,7 @@ If you find this repository helpful in your activities and publications, please
 ```
 Rossi M., Toscani N., Mauri M., Castelli-Dezza F., "Introduction to Microcontroller Programming for Power Electronics Control Applications: Coding with MATLAB and Simulink" (1st ed.) 2021, CRC Press. https://doi.org/10.1201/9781003196938
 ```
-The book has been sponsorized by Texas Instruments, Wuerth Elektronik and MathWorks.
+The book has been sponsored by Texas Instruments, Wuerth Elektronik and MathWorks.
 
 ## Running experiments
 Experiments (simulation and implementation) are split in root folders referring to the book chapters.