code: public void updateChangeset(long changesetId, final Map<String, String> tags)
  	{
  		osm.makeAuthenticatedRequest("changeset/"+changesetId, "PUT",
  				createOsmChangesetTagsWriter(tags), null);
  	}
docs: Set new the tags of a changeset (the old set of tags is deleted)
  
  @param tags the new tags of this changeset
  
  @throws OsmConflictException if the changeset has already been closed
  @throws OsmNotFoundException if the changeset does not exist (yet)
  @throws OsmAuthorizationException if the application does not have permission to edit the
  map (Permission.MODIFY_MAP)