Remove duplicate AUTHORS file in repo

[stv0g]

Most of the people in the old file are anyway listed in the AUTHORS.txt file.

[codecov[bot]]

Codecov Report

Base: 98.16% // Head: 98.16% // No change to project coverage :thumbsup:

Coverage data is based on head (c9b147c) compared to base (92fd614). Patch has no changes to coverable lines.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #133 +/- ## ======================================= Coverage 98.16% 98.16% ======================================= Files 19 19 Lines 1577 1577 ======================================= Hits 1548 1548 Misses 23 23 Partials 6 6 ``` | Flag | Coverage Δ | | |---|---|---| | go | `98.16% <ø> (ø)` | | | wasm | `57.61% <ø> (ø)` | | Flags with carried forward coverage won't be shown. [Click here](https://docs.codecov.io/docs/carryforward-flags?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=pion#carryforward-flags-in-the-pull-request-comment) to find out more. Help us with your feedback. Take ten seconds to tell us [how you rate us](https://about.codecov.io/nps?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=pion). Have a feature suggestion? [Share it here.](https://app.codecov.io/gh/feedback/?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=pion)

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[stv0g]

Hi @at-wat, I aligned this repo with the recent PR in the goassets repo.