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

• [x] I am following the contributing guidelines

• [x] Tests are passing

• [x] Lint workflow is passing

• [ ] Docs were updated and workflow is passing

• [ ] CHANGELOG.md was updated

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

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

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #464 +/- ## ========================================= Coverage 100.00% 100.00% ========================================= Files 4 4 Lines 99 99 ========================================= Hits 99 99 ```

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