Update about.html in folder "platform/edge"

[lychichem]

This fixes issue #98 .

[gorhill]

I don't understand this pull request. That line is already in there.

[lychichem]

@gorhill Yes, the line is already in there. But not the same file in /platform/edge. In released version, the extenion uses about.html from forder /platform/edge, and will cause issue #98 symptom two, which is caused by "vapi.js not found".

[gorhill]

Ah ok, I didn't realized there was another about.html.