Fix typo in interface method name

lib/dialects/query-generator.js

@@ -164,7 +164,7 @@ module.exports = (function() {
                    OR a string with conditions (e.g. 'name="foo"').
                    If you use a string, you have to escape it on your own.
     */
-    deleteQuery: function(tableName, where, options) {
+    bulkDeleteQuery: function(tableName, where, options) {
       throwMethodUndefined('bulkDeleteQuery')
     },