Update README.md

README.md

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 Keep smooth running averages without using arrays! No arrays. No Looping. Fast and Constant Time regardless of the sample window size!
 
-The sample size is adjustable at runtime. The average is available and accurate even before N samples have been received. The `Smooth` object uses 8 bytes of memory. That's it. No matter how large the window size. Perfect for smoothing and filtering signals from noisy devices **like accelerometers** and **potentiometer values**!
+The sample size is adjustable at runtime. The average is available and accurate even before N samples have been received. The `Smooth` object uses 8 bytes of memory. That's it. No matter how large the window size. Perfect for smoothing and filtering signals from noisy devices **like accelerometers** and **stable potentiometer readings**!
 
 update: added support for change, upper and lower bounds callbacks!