Please support whitespace after the ticks

[nolange]

Hello,

your parser is really picky, it should ignore whitespaces, or rather eat additional ones in the text following the "ticks". The vscode parser seems to do the right thing, still detecting the code blocks, but your plugin will refuse for ex. the following:

``` mermaid
graph TD;
    A-->B;
    A-->C;
    B-->D;
    C-->D;
```

(whitespace behind `mermaid`)
```mermaid 
graph TD;
    A-->B;
    A-->C;
    B-->D;
    C-->D;
```

Commonmark has some Examples on what to expect.

[Airkro]

it should support parse markdown code fence meta:

```mermaid custom meta, can be anything

[pomdtr]

fixed in v1.1.1