Release 0.27 (#470)

* Release 0.27

* Update changelog

- Remove `AsRef<str>` restriction from `PreEscaped`

  [#377](#377)
- Implement `Render` for `Arc<T>`
  [#380](#380)
- Fix missing parentheses around splices
  [#382](#382)
  [#383](#383)
- Accept literals in attribute names
  [#396](#396)
  [#398](#398)
  [#415](#415)
- Support `axum` v0.7 through `axum-core` v0.4 and `http` v1
  [#401](#401)
- Add support for `warp` v0.3.6
  [#404](#404)
- Support `rocket` v0.5
  [#406](#406)

- Remove `html_debug!`

  [#357](#357)
- Render with `Display` using autoref specialization
  [#359](#359)
- Support `axum` v0.6 through `axum-core` v0.3
  [#361](#361)
- Implement `Default` for `PreEscaped`
  [#371](#371)

- Remove blanket `Render` impl for `T: Display`

  [#320](#320)
- Support `axum` v0.5 through `axum-core` v0.2
  [#325](#325)
  [#337](#337)
- Update to `actix-web` 4.0.
  [#331](#331)
- Add a `maud::display` adapter that forwards to the `Display` impl
  [#350](#350)

- Update to support axum 0.2

  [#303](#303)
- Add support for `Option<T>` attributes using the `attr=[value]` syntax.
  [#306](#306)
- Update to Rust 2021
  [#309](#309)
- Remove Iron support
  [#289](#289)
- Disallow slashes (`/`) in void elements
  [#315](#315)

Bump `maud_htmlescape` version for `no_std` support

Release 0.22.2 (#253)

It tastes like apples.

but waaaaaaay more intense.

It's kind of like hide and seek