Update readme

ChatSDKCoreData/Assets/ChatSDK.xcdatamodeld/.xccurrentversion

@@ -3,6 +3,6 @@
 <plist version="1.0">
 <dict>
 	<key>_XCCurrentVersionName</key>
-	<string>DataModel v019.xcdatamodel</string>
+	<string>DataModel v020.xcdatamodel</string>
 </dict>
 </plist>

README.md

@@ -1,7 +1,7 @@
 # Chat SDK
 ### Open Source Messaging framework for iOS
 
-<img target="_blank" src="http://img.chatcatapp.com/chat-sdk-hand.jpg" />
+<img target="_blank" src="https://raw.githubusercontent.com/chat-sdk/dev/master/img/hand.png" />
 
 Chat SDK is a fully featured open source instant messaging framework for iOS. Chat SDK is fully featured, scalable and flexible and follows the following key principles:
 
@@ -12,7 +12,7 @@ Chat SDK is a fully featured open source instant messaging framework for iOS. Ch
 
 <!--A demo of the project is available on the App Store.  
 
-<a target="_blank" href="https://itunes.apple.com/us/app/chatcat/id962537653?mt=8"><img src="http://www.binpress.com/uploads/store33364/itunes-app-store-logo.png" width="290" height="100" alt="App Store" /></a>
+<a target="_blank" href="https://itunes.apple.com/us/app/chatcat/id962537653?mt=8"><img src="https://raw.githubusercontent.com/chat-sdk/dev/master/img/app-store.jpg" width="290" height="100" alt="App Store" /></a>
 -->
 ## Features
 
@@ -38,7 +38,7 @@ Full breakdown is available on the [features page](http://chatsdk.co/features/).
 ## Hire us to build your next app
 
 We are now taking on projects, we are a team of full stack developers who are Firebase experts.
-For more information check out our [consulting site](https://chat-sdk.github.io/dev/). 
+For more information check out our [consulting site](https://chat-sdk.github.io/hire-us/). 
 
 ## Quick Start