update README and commaand-line options

Author: sourena

README.md

@@ -170,6 +170,7 @@ Bulk DNS scanner based on sdns low-level DNS library.
 	--set-nsid			The packet has NSID in edns0
 	--noedns			Do not support EDNS0 in queries (Default supports EDNS0)
 	--server-mode			Run bulkDNS in server mode
+        --no-tcp                        Run the server-mode only for UDP (No TCP listening)
 	-h, --help			Print this help message
 
 bulkDNS currently supports the following RRs:

src/cmdparser.c

@@ -346,6 +346,9 @@ void arg_show_help(PARG_CMDLINE cmd, int argc, char ** argv){
     fprintf(stdout, "\t--server-mode\t\t\t\t");
     fprintf(stdout, "Run bulkDNS in server mode\n");
 
+    fprintf(stdout, "\t--no-tcp\t\t\t\t");
+    fprintf(stdout, "Run the server-mode only for UDP (No TCP listening)\n");
+
     fprintf(stdout, "\t-h, --help\t\t\t\t");
     fprintf(stdout, "Print this help message\n");