support yansongda#289

v2.8.6 support mongolog v2

v2.8.4 fix yansongda#264

v2.8.1 fix yansongda#257

v2.8.0 兼容 symfony/event-dispatcher 4.3 && 优化代码

v2.8.0-beta.0 兼容 symfony/event-dispatcher 4.3 && 优化代码