fix decoding

main.py

@@ -286,17 +286,17 @@ class IRCBot():
 
     def ping_pong(self):
         while True:
-            char = self.s.recv(1).decode("UTF-8")
+            char = self.s.recv(1)
             if not char:
                 exit(f"{self.nick}: no response from IRC server")
-            line = ""
+            line = b""
             while char:
-                if char == "\n":
+                if char == b"\n":
                     break
-                elif char != "\r":
+                elif char != b"\r":
                     line += char
-                char = self.s.recv(1).decode("UTF-8")
+                char = self.s.recv(1)
-            line = line.strip()
+            line = line.decode("UTF-8").strip()
             if line.startswith("PING"):
                 pong = "PONG " + line[5:]
                 self.sendline(pong)