docs: add notice about change to iterators

Author: hugomrdias

README.md

@@ -19,6 +19,10 @@ ipfs-multipart
 
 [Hugo Dias](https://github.com/hugomrdias)
 
+### Notice 
+> This module is moving to async iterators starting from 0.2.0.   
+> The last minor version to support event emitter is 0.1.1, any backports will merged to the branch `event-emitter` and released under  `>0.1.0 <0.2.0`.
+
 ## Install
 ```
 npm install ipfs-multipart