Add #nospoil tag

Signed-off-by: Izuru Yakumo <yakumo.izuru@chaotic.ninja>

main.py

@@ -135,6 +135,8 @@ class ChenBot(ClientXMPP):
     async def parse_urls(self, msg, urls, sender, mtype):
         if "nsfw" in msg["body"].lower():
             return
+        if "#nospoil" in msg["body"].lower():
+            return
         for u in urls:
             if u in self.messages[sender]["links"]:
                 continue