Add first command in Next Steps: exit() to exit Julia REPL

[luisaforozco]

Description

Minor addition to the message displayed 'Next steps' afteer generating using BestieTemplate or applying BestieTemplate to an existing package.
As explained in #463 I copy paste the instructions, but first one needs to exit the Julia REPL and execute the following commands in terminal.

I did not update the documentation (i.e. full guide) because I think it would be cumbersome and not necessary as what gets print in the terminal, but I am open to suggestions if you feel that we should update that too.

Same for CHANGELOG.md, I feel this is a very small change, but will added if is useful.

Related issues

Closes #463

Checklist

• I am following the contributing guidelines

• Tests are passing

• Lint workflow is passing

• Docs were updated and workflow is passing

• CHANGELOG.md was updated

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 100.00%. Comparing base (8ad8388) to head (4958b2d).
Report is 1 commits behind head on main.

Additional details and impacted files

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##              main      #464   +/-   ##
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  Coverage   100.00%   100.00%           
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  Files            4         4           
  Lines           99        99           
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  Hits            99        99           

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[abelsiqueira]

Thanks, this is great. No need to update the CHANGELOG and docs, indeed