adding counter increment in pkg-repl mode

[tlienart]

@gdalle can you give this one a shot and confirm it fixes #271 please?

[codecov-commenter]

Codecov Report

All modified lines are covered by tests :white_check_mark:

Comparison is base (c92dc3e) 84.67% compared to head (d7a493c) 84.67%.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #272 +/- ## ======================================= Coverage 84.67% 84.67% ======================================= Files 67 67 Lines 3726 3727 +1 ======================================= + Hits 3155 3156 +1 Misses 571 571 ``` | [Files](https://app.codecov.io/gh/tlienart/Xranklin.jl/pull/272?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Thibaut+Lienart) | Coverage Δ | | |---|---|---| | [src/convert/markdown/rules/code.jl](https://app.codecov.io/gh/tlienart/Xranklin.jl/pull/272?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Thibaut+Lienart#diff-c3JjL2NvbnZlcnQvbWFya2Rvd24vcnVsZXMvY29kZS5qbA==) | `82.53% <100.00%> (+0.09%)` | :arrow_up: |

:umbrella: View full report in Codecov by Sentry.
:loudspeaker: Have feedback on the report? Share it here.

[github-actions[bot]]

Preview should be up in a couple of mins at https://tlienart.github.io/Xranklin.jl/previews/PR272 (if you get a 404, wait 30s then refresh).

[gdalle]

it works, thanks!