Puma 3.4.0 发布了。与其他Ruby web服务器不同的是，Puma是为速度与并发而生的。Puma是一个为Ruby web程序提供高速处理以及HTTP 1.1并发的服务器小型库。它被设计只用来运行Rack程序。
更新内容
2个小功能:
Add ability to force threads to stop on shutdown. Fixes #938
Detect and commit seppuku when fork(2) fails. Fixes #529
3个未知
Ignore errors trying to update the backport tables. Fixes #788
Invoke the lowlevel_error in more places to allow for exception tracking. Fixes #894
Update the query string when an absolute URI is used. Fixes #937
5个Doc修复
Add Process Monitors section to top-level README
Better document the hooks. Fixes #840
docs/system.md sample config refinements and elaborations
Fix typos at couple of places.
Cleanup warnings
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