fix: uniqueKey/pgViewUniqueKey applies to views (#739)

Author: benjie

packages/graphile-build-pg/src/plugins/PgAllRows.js

@@ -64,7 +64,7 @@ export default (async function PgAllRows(
           const uniqueIdAttribute = viewUniqueKey
             ? attributes.find(attr => attr.name === viewUniqueKey)
             : undefined;
-          if (isView && table.tags.uniqueKey && !uniqueIdAttribute) {
+          if (isView(table) && table.tags.uniqueKey && !uniqueIdAttribute) {
             throw new Error(
               `Could not find the named unique key '${table.tags.uniqueKey}' on view '${table.namespaceName}.${table.name}'`
             );