SDK-523 update release notes.  Add known android issue.
SDK-523 update release notes.  Add known android issue.

BranchMetrics/cordova-ionic-phonegap-branch-deep-linking,BranchMetrics/Cordova-Ionic-PhoneGap-Deferred-Deep-Linking-SDK,BranchMetrics/Cordova-Ionic-PhoneGap-Deferred-Deep-Linking-SDK,BranchMetrics/Cordova-Ionic-PhoneGap-Deferred-Deep-Linking-SDK,BranchMetrics/cordova-ionic-phonegap-branch-deep-linking,BranchMetrics/cordova-ionic-phonegap-branch-deep-linking,BranchMetrics/cordova-ionic-phonegap-branch-deep-linking,BranchMetrics/cordova-ionic-phonegap-branch-deep-linking,BranchMetrics/Cordova-Ionic-PhoneGap-Deferred-Deep-Linking-SDK