Email Regexp: Allow dashes

lib/screens/settings_screen.dart

@@ -103,7 +103,8 @@ class SettingsListState extends State<SettingsList> {
           }
 
           bool emailValid =
-              RegExp(r"^[a-zA-Z0-9.]+@[a-zA-Z0-9]+\.[a-zA-Z]+").hasMatch(value);
+              RegExp(r"^[a-zA-Z0-9.\-]+@[a-zA-Z0-9\-]+\.[a-zA-Z\-]+")
+                  .hasMatch(value);
           if (!emailValid) {
             return 'Please enter a valid email';
           }