Update index.ts

Author: yulmwu

src/gist/index.ts

@@ -1,5 +1,6 @@
 import _create from './create';
 import _delete from './delete';
 import _get from './get';
+import _update from './update';
 
-export { _create, _delete, _get };
+export { _create, _delete, _get, _update };