Add TCP query

etc/smartdns/smartdns.conf

@@ -1,19 +1,43 @@
+# dns server bind ip and port, default dns server port is 53.
+# bind [IP]:port, 
+# example: 
+#   IPV4: :53
+#   IPV6  [::]:53
 
-# bind
-bind [::]:53
+bind :53
 
+# dns cache size
+# cache-size [number]
+#   0: for no cache
 cache-size 1024
+
+# set log level
+# loglevel [level], level=error, warn, info, debug
 loglevel error
 
-#server 8.8.8.8
+# remote udp dns server list
+# server [IP]:[PORT], default port is 53
+# CNNIC
 server 114.114.114.114
+#pure DNS
 server 123.207.137.88
+server 123.207.13.111 
+
+#dnspod
 server 119.29.29.29
+
+# alibaba dns
 server 223.5.5.5
+
 #BAU DNS
 server 223.113.97.99
+
+#OpenDNS
 server 208.67.222.222:5353
+
+#LUG
 server 202.141.178.13:5353
-#server 77.88.8.8:53
 server 202.141.162.123:53
-#server 101.132.183.99:53
+
+# remote tcp dns server list
+# server-tcp [IP]:[PORT], default port is 53