fix heartbeats once and for all (#1016)

src/client/websocket/packets/handlers/GuildMembersChunk.js

@@ -16,6 +16,8 @@ class GuildMembersChunkHandler extends AbstractHandler {
 
     guild._checkChunks();
     client.emit(Constants.Events.GUILD_MEMBERS_CHUNK, members);
+
+    client.ws.lastHeartbeatAck = true;
   }
 }
 

src/client/websocket/packets/handlers/Ready.js

@@ -7,7 +7,7 @@ class ReadyHandler extends AbstractHandler {
     const client = this.packetManager.client;
     const data = packet.d;
 
-    client.manager.ping();
+    client.ws.heartbeat();
 
     const clientUser = new ClientUser(client, data.user);
     client.user = clientUser;