updated libcoap-1.{map,sym} to include new option filter functions

With commit e4e2e57, three new functions have been added to the
public API, hence the symbol files need an update.

libcoap-1.map

@@ -1,4 +1,4 @@
-VER_1.0 {
+VER_1 {
 global:
   coap_add_attr;
   coap_add_block;
@@ -62,6 +62,9 @@ global:
   coap_opt_delta;
   coap_opt_encode;
   coap_option_check_critical;
+  coap_option_filter_get;
+  coap_option_filter_set;
+  coap_option_filter_unset;
   coap_option_iterator_init;
   coap_option_next;
   coap_opt_length;

libcoap-1.sym

@@ -60,6 +60,9 @@ coap_opt_block_num
 coap_opt_delta
 coap_opt_encode
 coap_option_check_critical
+coap_option_filter_get
+coap_option_filter_set
+coap_option_filter_unset
 coap_option_iterator_init
 coap_option_next
 coap_opt_length