Update README.md

README.md

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 # Arduino Dictionary
 
-This is a simple key-value dictionary for Arduino. It uses LinkedList (It has its own version within it to ensure compatibility).
+This is a simple key-value dictionary for Arduino. It uses LinkedList (It has its own version within it to ensure compatibility). This library has had very little testing, so use at your own risk.
 
 ## Installation
 1. Click Code > Download ZIP