Fix #102, Expose ha1 in UaSettings.

Author: cloudwebrtc

lib/src/constants.dart

@@ -1,4 +1,4 @@
-var USER_AGENT = 'dart-sip-ua v0.0.1';
+var USER_AGENT = 'dart-sip-ua v0.2.2';
 
 // SIP scheme.
 var SIP = 'sip';

lib/src/sip_ua_helper.dart

@@ -99,6 +99,7 @@ class SIPUAHelper extends EventManager {
     _settings.sockets = [socket];
     _settings.uri = uaSettings.uri;
     _settings.password = uaSettings.password;
+    _settings.ha1 = uaSettings.ha1;
     _settings.display_name = uaSettings.displayName;
     _settings.authorization_user = uaSettings.authorizationUser;
     _settings.user_agent = uaSettings.userAgent ?? DartSIP_C.USER_AGENT;
@@ -518,6 +519,7 @@ class UaSettings {
   String uri;
   String authorizationUser;
   String password;
+  String ha1;
   String displayName;
 
   List<Map<String, String>> iceServers = [