Blocks made with pipes have a leading new line

Hello,

I just tried the online demo which turns YAML into JSON and I found out that the blocks of text made with a pipe sign end up having a leading return line.

For example:

```

---
text: |
  hello
  world
```

Becomes:

```
{text: "\nhello\nworld"}
```

As far as I know this is not the behaviour of other parsers I've used.
Not sure which one is the standard.

Thank you,
mig
