Update README.md

Author: manueldidonna

README.md

@@ -2,7 +2,7 @@
 
 <p>
   <img width="24%" src="art/puppies_list_light.png?raw=true">
-  <img width="24%" src="art/puppies_list_dark.png?raw=true">
+  <img width="24%" src="art/puppies_list_night.png?raw=true">
   <img width="24%" src="art/puppy_details_light.png?raw=true">
   <img width="24%" src="art/puppy_details_night.png?raw=true">
 </p>
@@ -24,4 +24,4 @@ GNU General Public License for more details.
 
 You should have received a copy of the GNU General Public License
 along with this program. If not, see https://www.gnu.org/licenses.
-</code></pre>
+</code></pre>