Update middleware.md

[x22x22]

middlewares是不是应该改成middleware?

Checklist

• npm test passes
• tests and/or benchmarks are included
• documentation is changed or added
• commit message follows commit guidelines

Affected core subsystem(s)

Description of change

[atian25]

两个都可以的，印象中早期 app.middleware 是被 Koa 占用了的，后面好像搞定了。cc @popomore

[codecov-io]

Codecov Report

Merging #2069 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #2069   +/-   ##
=======================================
  Coverage   99.59%   99.59%           
=======================================
  Files          29       29           
  Lines         743      743           
=======================================
  Hits          740      740           
  Misses          3        3

---

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[x22x22]

那能在文档里说明一下吗?
因为用了typescript, 定义文件里没对middlewares属性进行描述, 这样乍一看还以为文档有问题.

[popomore]

搞定了，可以用 middleware 了

[atian25]

@x22x22 提个 PR 吧，改为 app.middleware 吧，英文版也要改

[x22x22]

#2077
@atian25