add missing schema files for version 86

schema/versions/mysql/86.sql

@@ -0,0 +1,9 @@
+begin;
+
+alter table ttrss_user_entries add column uuid varchar(200);
+update ttrss_user_entries set uuid = '';
+alter table ttrss_user_entries change uuid uuid varchar(200) not null;
+
+update ttrss_version set schema_version = 86;
+
+commit;