version 4.0 added to breaking changes

Author: manolodewiner

README.md

@@ -21,7 +21,9 @@
 | `>= 2.0.0`        | `4.x.x`                      |
 
 ## Breaking changes
-Version 3.2 of BigchainDB JavaScript Driver introduces a new way of creating transfer transactions. Check [older versions](https://docs.bigchaindb.com/projects/js-driver/en/latest/readme.html#features)
+
+- **Version 4.0** of BigchainDB JavaScript Driver makes the driver compatible with BigchainDB 2.0. There are new functions for posting transactions. Check [older versions](https://docs.bigchaindb.com/projects/js-driver/en/latest/readme.html#features)
+- **Version 3.2** of BigchainDB JavaScript Driver introduces a new way of creating transfer transactions. Check [older versions](https://docs.bigchaindb.com/projects/js-driver/en/latest/readme.html#features)
 
 ## Contents