Update wc-custom-order-table.php

Bump WooCommerce tested version.

Author: lukecav

wc-custom-order-table.php

@@ -11,7 +11,7 @@
  * Description:           Store WooCommerce order data in a custom table.
  * Version:               1.0.0
  * WC requires at least:  3.0.0
- * WC tested up to:       3.2.5
+ * WC tested up to:       3.2.6
  * Requires at least:     4.7
  * Tested up to:          4.9.1
  */