docs: improve documentation (#48)

Closes #47 

Co-authored-by: Kent C. Dodds <[email protected]>

Author: jasperck

README.md

@@ -69,6 +69,11 @@ You use it in place of `React.useEffect`.
 > `useDeepCompareEffectNoCheck`, but do it at your own risk, as maybe there can
 > be better approaches to the problem.
 
+> NOTE: Be careful when your dependency is an object which contains function.
+> If that function is defined on the object during a render, then it's changed
+> and the effect callback will be called every render.
+> [Issue](https://github.com/kentcdodds/use-deep-compare-effect/issues/47) has more context.
+
 Example:
 
 ```jsx