Privilge on sequences are not diffed

[provokateurin]

SQL a:

create sequence test increment by 1;

SQL b:

create sequence test increment by 1;
grant usage on sequence test to postgres;

This produces an empty diff.

EDIT: I verified that schemainspect correctly produces create and drop statements for given privileges.

[provokateurin]

I've looked through all the migra code and it works correctly. The problem is schemainspect only returns the privileges for tables. https://github.com/djrobstep/schemainspect/blob/2e417046faad56dd435a9c84050c832ea5f44372/schemainspect/pg/sql/privileges.sql should be updated and then it should work I think.

[provokateurin]

This is a starting point, but it doesn't include the schema of the sequence which needs to be queried separately.

[provokateurin]

Ah I see #64 and djrobstep/schemainspect#67 are already there. Sorry for the noise, should have looked there first.