Change start() return type from Job to Any since return value not needed

src/main/kotlin/com/shr4pnel/ferretirc/net/messages/MessageIO.kt

@@ -2,11 +2,10 @@ package com.shr4pnel.ferretirc.net.messages
 
 import io.ktor.network.sockets.Socket
 import kotlinx.coroutines.CoroutineScope
-import kotlinx.coroutines.Job
 import kotlinx.coroutines.channels.Channel
 
 abstract class MessageIO(val socket: Socket, val scope: CoroutineScope) {
     val incomingMessages = Channel<String>(Channel.BUFFERED)
     val outgoingMessages = Channel<ClientMessage>(Channel.BUFFERED)
-    abstract fun start(): Job
+    abstract fun start(): Any
 }