Note about breaking things

Signed-off-by: Fabio José <[email protected]>

Author: fabiojose

README.md

@@ -13,7 +13,10 @@ Official CloudEvents' SDK for JavaScript.
 
 <img src="https://github.com/cncf/artwork/blob/master/projects/cloudevents/horizontal/color/cloudevents-horizontal-color.png" width="300" height="58" alt="CloudEvents logo">
 
-__Checkout the [changelog](./CHANGELOG.md) to see what's going on!__
+**NOTE: This SDK is still considered work in progress, things might (and will)
+break with every update.**
+
+**Checkout the [changelog](./CHANGELOG.md) to see what's going on!**
 
 ## Contributing