RFR: webrev: proper index.html fix and charset fixes

[Robin Westberg]

On Wed, 3 Jun 2020 12:35:36 GMT, Erik Helin <ehelin at openjdk.org> wrote:

> Hi all,
> 
> please review this patch that fixes two issues in webrev:
> 
> 1. Use a more robust band-aid for the problem when generating a webrev for a file named `index.html`
> 2. Try multiple charsets when reading files from disk
> 
> Testing:
> - Manual testing of `git webrev` on Linux x64
> - `make test` passes on Linux x64
> 
> Thanks,
> Erik

Looks good!

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Marked as reviewed by rwestberg (Reviewer).

PR: https://git.openjdk.java.net/skara/pull/637