v0.9.1

[Refactor] MiddlewarePipe refactor (#8)

* ♻️ refactor MiddlewarePipe

+ make trace info cleaner by removing closure
+ add protection against middleware running `$next` twice

* ✨ nimo: Introducing imutable PipeNextHandler to preserver  handler state

* 📝 add docs

v0.9.0

✨ nimo: use interface instead of raw callable for exception handler

v0.9.0-RC1

prerelease for 0.9