Update README.md

Author: danieledep

README.md

@@ -6,10 +6,10 @@
 A dithering playground, built on the NASA APIs.  
 demo: [https://danieledep.github.io/rovers-dithering-playground/](https://danieledep.github.io/rovers-dithering-playground/)  
 
-![postard demo 1](https://github.com/danieledep/rovers-dithering-playground/blob/main/assets/Curiosity-1331-558097.jpeg)
+![postcard demo 1](https://github.com/danieledep/rovers-dithering-playground/blob/main/assets/Curiosity-1331-558097.jpeg)
 *A postcard from the Curiosity rover at Gale Crater*  
 
-![postard demo 1](https://github.com/danieledep/rovers-dithering-playground/blob/main/assets/Curiosity-46-31799.jpeg)
+![postcard demo 2](https://github.com/danieledep/rovers-dithering-playground/blob/main/assets/Curiosity-46-31799.jpeg)
 *A eerie finding from Curiosity*   
 
 ## Build