updated new flutter version

lib/widgets/mobile/mobile_login.dart

@@ -160,7 +160,7 @@ class MobileLoginState extends State<MobileLogin> {
             mainAxisAlignment: MainAxisAlignment.start,
             crossAxisAlignment: CrossAxisAlignment.start,
             children: <Widget>[
-              FlatButton(
+              TextButton(
                 child: Text(
                   S.of(context).new_user_question,
                   style: TextStyle(
@@ -175,7 +175,7 @@ class MobileLoginState extends State<MobileLogin> {
                 child: Text(''),
               ),
               Container(
-                child: FlatButton(
+                child: TextButton(
                   child: Text(
                     S.of(context).forgot_password_question,
                     style: TextStyle(
@@ -194,8 +194,10 @@ class MobileLoginState extends State<MobileLogin> {
           alignment: Alignment.centerRight,
           child: Container(
             padding: EdgeInsets.only(top: 20.0, left: 16.0, right: 16.0, bottom: 20.0),
-            child: RaisedButton(
-              color: Theme.of(context).primaryColor,
+            child: ElevatedButton(
+              style: ElevatedButton.styleFrom(
+                primary: Theme.of(context).primaryColor,
+              ),
               child: Text(
                 S.of(context).login,
                 style: TextStyle(