Update README.md

Author: Olga Danylova

README.md

@@ -1,7 +1,7 @@
 Backendless SDK for iOS (http://backendless.com)
 ---
 
-# Version 4.0.4
+# Version 4.0.5
 
 ## GETTING STARTED WITH BACKENDLESS
 The simplest way to get started with Backendless is by using a Project Template for iOS:
@@ -27,14 +27,18 @@ To create a new project with CocoaPods, follow the instructions below:
 3. Create a Podfile. This can be done by running `pod init`.
 4. Open your Podfile with a text editor, and add the following
 ```
-pod 'Backendless', '4.0.4'
+pod 'Backendless', '4.0.5'
 ```
 5. Save Podfile, return to Terminal window and run `pod install` and `pod update`. Once all of the pod data is downloaded/updated, Xcode project workspace file will be created. This is the file you must open when working on your app.
 6. Open .xcworkspace file to launch your project.
 7. If you use Swift, it is necessary to add a bridging header file. Navigate to "Build Settings -> Swift Compiler ... -> Objective-C Bridging Header" and add the following:
 `${PODS_ROOT}/Headers/Public/Backendless/Backendless-Bridging-Header.h`
 
 ## RELEASE HISTORY
+4.0.5 August 4, 2017
+* The user registration bug when adding to users one after another fixed
+* NSNull values changed to nil for dictionary/map approach
+
 4.0.4 July 26, 2017
 * The error when SDK don't send user token header to the server fixed