Update README.md

Author: vshymanskyy

README.md

@@ -14,6 +14,8 @@ The library was verified to work with:
 
 **Note:** it requires at least **~64Kb** Flash and **~10Kb** RAM even for minimal functionality.
 
+## Disclaimer
+
 Please also note that Arduino API here is just for an example. We do not encourage this way of programming, and we have to come up with a better API (i.e. **Event-Driven**, **Resource-Oriented** or similar).
 
 ### License