add missing column to 1.0.6-1.0.7 upgrade script

schema/upgrade-1.0.6-1.0.7-pgsql.sql

@@ -2,9 +2,11 @@ begin;
 
 alter table ttrss_feeds add column last_error text;
 alter table ttrss_feeds add column site_url varchar(250);
+alter table ttrss_feeds add column update_interval integer;
 
 update ttrss_feeds set last_error = '';
 update ttrss_feeds set site_url = '';
+update ttrss_feeds set update_interval = 0;
 
 alter table ttrss_feeds alter column last_error set not null;
 alter table ttrss_feeds alter column last_error set default '';
@@ -12,6 +14,9 @@ alter table ttrss_feeds alter column last_error set default '';
 alter table ttrss_feeds alter column site_url set not null;
 alter table ttrss_feeds alter column site_url set default '';
 
+alter table ttrss_feeds alter column update_interval set not null;
+alter table ttrss_feeds alter column update_interval set default 0;
+
 create table ttrss_version (schema_version int not null);
 
 insert into ttrss_version values (1);