Fix "pardon the interruption" popup block

[thebaer]

We must no longer "pardon the interruption" -- now we can "extend our stay" and so on. The <h1> text in this popup changed, and there seems to be a few titles that get displayed. So now we look to the <h2> instead for blocking the readus interruptus popup.

This fixes #51.

[jhass]

Seems to target it correctly, however at least on https://medium.com/mergify/automatic-merge-of-github-security-fixes-87d7781140c0 I see basically the animation still before it vanishes. But that doesn't seem to happen for all articles, somehow. It feels it has to do with how fast the page loads, so the basically the images there delaying the load somewhat.

[thebaer]

Yeah, I'm not sure how to get rid of the animation unfortunately. But this at least hides it for now

[a1russell]

Do you plan on merging/releasing this any time soon?

[thebaer]

These changes don't completely fix the issue anymore -- Medium is still making all kinds of changes that invalidate work here.