Update README.md

[adamltyson]

Updated wording (preprint -> paper)

[deprecated-napari-hub-preview-bot[bot]]

Preview page for your plugin is ready here: https://preview.napari-hub.org/brainglobe/cellfinder-napari/154 Created: 2023-04-24T12:38:38.593939

[codecov[bot]]

Codecov Report

Patch and project coverage have no change.

Comparison is base (d66f030) 95.35% compared to head (46e0c67) 95.35%.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #154 +/- ## ======================================= Coverage 95.35% 95.35% ======================================= Files 17 17 Lines 797 797 ======================================= Hits 760 760 Misses 37 37 ``` 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=brainglobe). 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=brainglobe)

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