clean: add ttl and max_retries in usage print

src/print.c

@@ -14,6 +14,9 @@ void print_usage(void)
 	printf("--file: File name containing IP addresses to scan\n");
 	printf("--speedup: [250 max] number of parallel threads to use\n");
 	printf("--scan: NULL/SYN/FIN/XMAS/ACK/UDP\n");
+	printf("--max_retries: number of retries when host doesn't reply\n");
+	printf("--ttl: precise the ttl\n");
+	
 }
 
 void print_config(const struct scan *general, const char *hosts_path,