Update README.md about MacOS support

Author: duncanpo

README.md

@@ -4,7 +4,7 @@ MATLAB® interface to [OpenTelemetry™](https://opentelemetry.io/), base
 
 ### Status
 - Currently only tracing is supported. Metrics and logs will be in the future.
-- This package is supported and has been tested on Windows® and Linux®. We will add macOS support in the future. 
+- This package is supported and has been tested on Windows®, Linux®, and macOS.
 
 ### MathWorks Products (https://www.mathworks.com)