Invalid result when using anchors with non standard attributes

[diegobanuelos]

Hi, great library. When making tests using your project I noticed an invalid result with the following case:

<a href="https://www.validurl.com" data-saferedirecturl="https://www.validurl.com/file.png">Valid text</a>

Reviewing your code, I added the attribute data-saferedirecturl to the htmlAttributes array in the dictionary and It worked; however, it will resolve only this specific case and not others with different non standard attribute names. What do you think about making the function isInsideAnchorTag ignore all the urls inside any property of an anchor?

[alexcorvi]

Thank you for the report.
fixed in 2.1.1.