FIX IMAGE_TYPES tuple.

settings/config.py

@@ -91,4 +91,10 @@ logger.dictConfig(LOGGING_CONFIG)
 # Tuple of image type on image links.
 # e.g: https://cdn.discordapp.com/attachments/720808802340962357/988542480981061702/cat.jpeg
 # e.g: https://cdn.discordapp.com/attachments/720808802340962357/988542480981061702/unknow.png
-IMAGE_TYPES = ('jpeg','jpg','png')
+IMAGE_TYPES = (
+    '.jpeg',
+    '.jpg',
+    '.png',
+    '.mp4',
+    '.gif',
+)