zine v0.13.0 reports error for basic quote block

[zhongsp]

I guess it's a regression issue, because my code works months ago, but fails after installing zine v0.13.0.

---

Installed the latest Zine lib:

$ cargo install zine
    Updating crates.io index
     Ignored package `zine v0.13.0` is already installed, use --force to override

Given a basic quote block from official doc:

```quote
author = "x"
bio = "y"
content = "z"

Run zine serve, an error occurred:

$ zine serve
listening on http://127.0.0.1:3000
thread '<unnamed>' panicked at 'called `Result::unwrap()` on an `Err` value: Parse quote block error: missing field `content` at line 1 column 1', C:\Users\xxx\.cargo\registry\src\github.com-1ecc6299db9ec823\zine-0.13.0\src\code_blocks\mod.rs:92:53
note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace
Watch build error: task 10 panicked

If remove the quote block it works again.

[Folyd]

That is weird, did you set a content?

missing field `content` at line 1 column 1

[zhongsp]

I'm sure the format is correct and has a content field as described in issue description.