Lee Moody 24bf7b132d fix(gfm-codeblock): add support for spaces before language declaration
One or more spaces before the language declaration of a code block is supported by Github.

E.g.

```    html
<div>HTML!</div>
```

``` html
<div>HTML!</div>
```

```html
<div>HTML!</div>
```

Closes #569
2018-10-16 23:00:36 +01:00
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