Update README.md

Author: samcday

README.md

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-**Consider using [Node 16+ Utility Consumers](https://nodejs.org/dist/latest-v16.x/docs/api/webstreams.html#utility-consumers) rather than this library**
+**!! Consider using [Node 16+ Utility Consumers](https://nodejs.org/dist/latest-v16.x/docs/api/webstreams.html#utility-consumers) rather than this library. !!**
 
 Simple Readable and Writable Streams that use a [Buffer][node-buffer-docs] to store received data, or for data to send out. Useful for test code, debugging, and a wide range of other utilities.