Add syntax highlighting to README

Author: KrauseFx

README.md

@@ -88,9 +88,11 @@ ViewDeck supports a left and a right side view controller. Each of these can be
 
 You can also switch view controllers in mid flight. Just assign a view controller to the appropriate property and the view deck controller will do the rest:
 
-	// prepare view controllers
-	UIViewController* newController = [[UIViewController alloc] init];
-	self.viewDeckController.rightController = newController;
+```objc
+// prepare view controllers
+UIViewController* newController = [[UIViewController alloc] init];
+self.viewDeckController.rightController = newController;
+```
 
 You can also use this to remove a side controller by just setting it to `nil`.
 
@@ -162,4 +164,4 @@ I would appreciate it to mention the use of this code somewhere if you use it in
 [image-6]:	https://img.shields.io/cocoapods/l/AFNetworking.svg?style=flat-square
 [image-7]:	https://img.shields.io/cocoapods/p/ViewDeck.svg?style=flat-square
 [image-8]:	https://cldup.com/PR00jqJzsS.png
-[image-9]:	https://cldup.com/8bIJ_PgdIP.png
+[image-9]:	https://cldup.com/8bIJ_PgdIP.png