refactor: align types/index.d.ts

Co-authored-by: Rik Smale <13023439+WikiRik@users.noreply.github.com>

types/index.d.ts

@@ -1,6 +1,6 @@
 import DataTypes = require("./lib/data-types");
 import Deferrable = require("./lib/deferrable");
-import Op = require('../lib/operators');
+import Op = require("../lib/operators");
 import QueryTypes = require("./lib/query-types");
 import TableHints = require("./lib/table-hints");
 import IndexHints = require("./lib/index-hints");