Update method call signature

https://github.com/yiisoft/yii2/blob/master/docs/guide/extensions.md#bootstrap-with-extension

https://github.com/yiisoft/yii2/commit/586f5b87b0b702a771455d7c283190b2e18f15e0#diff-607032a842d873c83dbc6f6ca6381129L134