Fix casing on walkthrough

README.md

@@ -7,7 +7,7 @@
 
 Atlas is a lightweight, flexible set of user interface components designed to enable developers to quickly and easily integrate native communications experiences into their applications. It was designed and built from the ground up to integrate with [LayerKit](https://github.com/layerhq/releases-ios#layerkit), the native iOS SDK for accessing the [Layer](https://layer.com) communications platform. LayerKit provides developers with a simple, object oriented interface to the rich messaging capabilities provided by the Layer platform. Atlas, in turn, provides ready-made UI components that expose these capabilities directly to users.
 
-![Walkthrough](Examples/Screenshots/Walkthrough.gif)
+![Walkthrough](Examples/Screenshots/walkthrough.gif)
 
 ## Overview