No syntax highlighting when using triple-tick's code highlighting

[rklec]

This plugin only highlights intended code blocks. See also https://github.com/svivian/q2a-markdown-editor/issues/19

Code:

Example code:

    var test = "string";
    var test = "string" + 1 + obj.goReady();

Other:
```
var test = "string";
var test = "string" + 1 + obj.goReady();
```