Update README.md

Author: jmulford-bw

README.md

@@ -23,6 +23,7 @@ PHP Client library for Bandwidth's Phone Number Dashboard (AKA: Dashboard, Iris)
 | 2.5.1 | Fixed grabbing of response header for file uploads |
 | 3.0.0 | Updated to guzzle 7. This version no longer supports verisons of PHP less than 7.2. Older versions of this package will still work on PHP versions less than 7.2 |
 | 3.1.0 | Added application management |
+| 3.2.0 | Update SipPeerTelephoneNumber to enable/disabe SMS |
 
 ## Supported PHP Versions