put a 20 second timeout on wait_for calls

ircrobots/server.py

@@ -27,6 +27,7 @@ from .interface import ITCPTransport, ITCPReader, ITCPWriter
 THROTTLE_RATE = 4  # lines
 THROTTLE_TIME = 2  # seconds
 PING_TIMEOUT  = 60 # seconds
+WAIT_TIMEOUT  = 20 # seconds
 
 JOIN_ERR_FIRST = [
     ERR_NOSUCHCHANNEL,
@@ -287,6 +288,7 @@ class Server(IServer):
             label = str(sent_line.id)
             our_wait_for.with_label(label)
 
+        async with timeout(WAIT_TIMEOUT):
             return (await our_wait_for)
 
     async def _on_send_line(self, line: Line):