Internal link to the Request Methods header is broken in README

[imcaizheng]

- [Request Methods (POST, PUT, HEAD, etc.)](#request-methods)

does not link to

## Request Methods (POST, PUT, HEAD, etc.)

Either change #request-methods to request-methods-post-put-head-etc
or shrink the header to Request Methods and it should works.

[0crat]

@yegor256/z please, pay attention to this issue

[yegor256]

@imcaizheng fixed, thanks