[Bug]: Link is inserted twice - v3.3.0-rc.7

[jfg69]

I'm submitting a

• Regression (a behavior that used to work and stopped working in a new release)
• Bug report
• Enhancement
• Feature request
• Documentation issue or request

Description

Since the last version you add a new feature in the link feature.
But the link is add 2 times in the html code.
Also, the text is format in another font style than the one in the document

The same thing append in your demo site https://ngx-editor.stackblitz.io/

Thanks for you great job.

Version Information

ngx-editor: 3.3.0-rc.7
angular: 5.2.0

### Browser

- [x] Chrome - 63.0.3239.132 (Build officiel) (64 bits)
- [x]  Mozilla Firefox -57.3.3
- [x] Microsoft Edge - 41.16299.248.0

[github-actions]

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