fix partitioned tables were not recognized as existent

src/PgFeatureType.ts

@@ -75,7 +75,8 @@ export class PgFeatureType extends FeatureType {
                    JOIN   pg_catalog.pg_namespace n ON n.oid = c.relnamespace
                    WHERE  n.nspname = $1
                    AND    c.relname = $2
-                   AND    (c.relkind = 'r' OR c.relkind = 'v' )    -- only tables or views
+                   AND    c.relkind IN ('r','v','p')
+                   -- only tables or views or 'partitioned tables'
                    );`;
 
         let exists;