Update README.md

Providing images with shadows on the edges for better visualization

Author: Raúl Gómez Acuña

README.md

@@ -58,9 +58,9 @@ Full API documentation can be found here: [API documentation](./docs/API.md).
 ## Example app
 The repo includes an example app that covers all the API cases. Go [here](./example) to try it out!
 
-![image](https://user-images.githubusercontent.com/4982414/29331952-92fd2cfc-81fe-11e7-9ef3-25f0e17a0c62.png)
+![image](https://user-images.githubusercontent.com/4982414/29513573-0f5acf5a-8666-11e7-989e-30409a50cb8c.png)
 
-![image](https://user-images.githubusercontent.com/4982414/29332055-f2e25ffc-81fe-11e7-87de-3473d2d74573.png)
+![image](https://user-images.githubusercontent.com/4982414/29513689-5f64b4ac-8666-11e7-86fc-0eeea7813630.png)
 
 ## Development