docs: add akkshitgupta as a contributor for code, and bug

[allcontributors]

Adds @akkshitgupta as a contributor for code, bug.

This was requested by jonaslagoni in this comment

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[coveralls]

Pull Request Test Coverage Report for Build 7913514543

Warning: This coverage report may be inaccurate.

This pull request's base commit is no longer the HEAD commit of its target branch. This means it includes changes from outside the original pull request, including, potentially, unrelated coverage changes.

• For more information on this, see Tracking coverage changes with pull request builds.
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• For a quick fix, rebase this PR at GitHub. Your next report should be accurate.

Details

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 92.326%

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Totals
Change from base Build 7913503203:	0.0%
Covered Lines:	5993
Relevant Lines:	6324

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💛 - Coveralls

[asyncapi-bot]

🎉 This PR is included in version 3.3.0 🎉

The release is available on:

• npm package (@latest dist-tag)
• GitHub release

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[asyncapi-bot]

🎉 This PR is included in version 4.0.0-next.5 🎉

The release is available on:

• npm package (@next dist-tag)
• GitHub release

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