Update acknowledgement section in README.md

Author: cehfisher

README.md

@@ -134,7 +134,7 @@ Please refer to the [SUPPORT](./SUPPORT.md) file for more information.
 
 ## Acknowledgement
 
-TODO: Thank you to our beta testers for their help in testing this project.
+Thank you to our beta testers for their help in testing this project.
 
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