Allow adding additional columns to ParseUser through the set call (parse-community#232)

Author: VigneshPasupathy

README.md

@@ -441,6 +441,13 @@ Also, once logged in you can manage sessions tokens. This feature can be called
 ```dart
 user = ParseUser.currentUser();
 ```
+
+To add additional columns to the user:
+```dart
+var user = ParseUser("TestFlutter", "TestPassword123", "[email protected]")
+            ..set("userLocation", "FlutterLand");
+```
+
 Other user features are:-
  * Request Password Reset
  * Verification Email Request

lib/src/objects/parse_user.dart

@@ -136,10 +136,7 @@ class ParseUser extends ParseObject implements ParseCloneable {
         return null;
       }
 
-      final Map<String, dynamic> bodyData = <String, dynamic>{};
-      bodyData[keyVarEmail] = emailAddress;
-      bodyData[keyVarPassword] = password;
-      bodyData[keyVarUsername] = username;
+      final Map<String, dynamic> bodyData = _getObjectData();
       final Uri url = getSanitisedUri(_client, '$path');
       final String body = json.encode(bodyData);
       _saveChanges();