message: fixed returning message by knex
diff: @@ -188,7 +188,7 @@ class KnexEntityDataProvider implements EntityDataProvider {
  if (isAutoIncrement(this.entity.idMetadata.field)) {
  let newId;
  if (this.knex.client.config.client === 'mysql2') {
  - let result = await this.knex(e.entityName).insert(insertObject, this.entity.idMetadata.field.key);
  + let result = await insert;
  newId = result[0];
  }
  else {
  