Corrected url

Author: code2k13

README.md

@@ -73,7 +73,7 @@ This image was downloaded from Wikimedia Commons and star mask was created by me
 
 Link to the processed image: [training_data/star_map_base.png](training_data/star_map_base.png)
 
->[ESO/G. Beccari](https://commons.wikimedia.org/wiki/File:The_star_cluster_NGC_3572_and_its_dramatic_surroundings.jpg"), [https://creativecommons.org/licenses/by/4.0] (via Wikimedia Commons) 
+>[ESO/G. Beccari](https://commons.wikimedia.org/wiki/File:The_star_cluster_NGC_3572_and_its_dramatic_surroundings.jpg"), [https://commons.wikimedia.org/wiki/File:The_star_cluster_NGC_3572_and_its_dramatic_surroundings.jpg] (via Wikimedia Commons) 
 
 Url: [https://commons.wikimedia.org/wiki/File:Antennae_galaxies_xl.jpg](https://commons.wikimedia.org/wiki/File:Antennae_galaxies_xl.jpg)