Added server:ipv6 to example config.

etc/example.conf

@@ -24,6 +24,8 @@ server "Freenode" {
     ajoin "#freenode,#somebot";
     # Auto rejoin on kick.
     autorejoin 0;
+    # Use IPv6?
+    ipv6 0;
 }
 
 # Server block.
@@ -51,6 +53,8 @@ server "Thinstack" {
     ajoin "#somebot";
     # Auto rejoin on kick.
     autorejoin 0;
+    # Use IPv6?
+    ipv6 0;
 }
 
 # Privileges.