fix demo.conf bug, remove the log_dir, because it's renamed to ff_log_dir

@@ -178,6 +178,7 @@ See also: [Performance Test Guide](https://github.com/winlinvip/simple-rtmp-serv
 * nginx v1.5.0: 139524 lines <br/>
 
 ## History
+* v1.0, 2014-03-26, Support RTMP ATC for HLS/HDS to support backup(failover).
 * v1.0, 2014-03-23, support daemon, default start in daemon.
 * v1.0, 2014-03-22, support make install/install-api and uninstall.
 * v1.0, 2014-03-22, add ./etc/init.d/srs, refine to support make clean then make.

@@ -4,7 +4,6 @@
 
 listen              1935;
 chunk_size          60000;
-log_dir             ./objs/logs;
 max_connections     2000;
 
 vhost __defaultVhost__ {