chore: updated version number for deprecated methods

Author: ethanneff

README.md

@@ -680,7 +680,7 @@ compile "io.branch.sdk.android:library:2.+"
 
 ### <a id="deprecated-event-listeners"></a>Gobal Event Listeners
 
-Before version XXX Branch used globaly defined listeners to pass events generated
+Before version 2.4.0 Branch used globaly defined listeners to pass events generated
 by clicking on links outside your cordova app into it. To make this behavior more
 explicit, we've shifted to event listeners passed to the branch object via the
 [`branch.initSession(onBranchLinkHook)`](#initSession) and