feat(postgraphql): allow single schema
feat(postgraphql): allow single schema

postgraphql/postgraphql,postgraphql/postgraphql,nbushak/postgraphql,postgraphql/postgraphql,calebmer/postgraphql,postgraphql/postgraphql,nbushak/postgraphql,calebmer/postgraphql,calebmer/postgraphql,calebmer/postgraphql,nbushak/postgraphql,nbushak/postgraphql