Update script.py

Mark duplicate files as being downloaded to prevent them from being downloaded again

script.py

@@ -165,6 +165,7 @@ def download(submissions):
               
         except FileAlreadyExistsError:
             print("It already exists")
+            GLOBAL.downloadedPosts.add(details['POSTID'])
             duplicates += 1
 
         except ImgurLoginError:
@@ -362,4 +363,4 @@ if __name__ == "__main__":
         print(GLOBAL.log_stream.getvalue())
 
     if not GLOBAL.arguments.quit: input("\nPress enter to quit\n")
-              
+