Convert generates not working SQL from $elemMatch

[vyacheslav-sozap]

As I can see from test:
https://github.com/thomas4019/mongo-query-to-postgres-jsonb/blob/master/test/filter.js#L33
that query like

{"roles": {"$elemMatch": "Admin"}}

should give SQL like

'data @> \'{ "roles": "Admin" }\''

but if we want to match against any array element, that SQL doesn't do that, it's just checking if "roles" contains string "Admin", so, probably, it should be done somehow else.