Akka v2.4.5_2.12-M4 发布 Actor 模型开发库

Akka v2.4.5_2.12-M4 发布了，Akka 是一个用 Scala 编写的库，用于简化编写容错的、高可伸缩性的 Java 和 Scala 的 Actor 模型应用。

本次发布值得关注的内容：

The cluster client and the cluster client receptionist now allow for subscribers to which the changes to the current set of contacts or clients will be announced. (#20446)
FileIO streams factory methods using java.nio.Path added and the old File (#20390)
A bug in the Akka scheduler making it stop running scheduled events in a long lived actor system (#20424), thanks to ecartner for finding and reproducing this issue
Registration of custom MediaTypes for Akka HTTP (#20397)
Scala Routing DSL’s (experimental) Rest path matcher was changed to be Remaining to be more consistent with other parts of the routing DSL