Update README.md how to bumpver on tag num

[codecov[bot]]

Codecov Report

Patch and project coverage have no change.

Comparison is base (df45eb5) 79.32% compared to head (4c4f1f7) 79.32%.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #470 +/- ## ======================================= Coverage 79.32% 79.32% ======================================= Files 27 27 Lines 3685 3685 ======================================= Hits 2923 2923 Misses 762 762 ``` | Flag | Coverage Δ | | |---|---|---| | python-3.10 | `79.32% <ø> (ø)` | | | python-3.8 | `?` | | | python-3.9 | `?` | | Flags with carried forward coverage won't be shown. [Click here](https://docs.codecov.io/docs/carryforward-flags?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=aiidalab#carryforward-flags-in-the-pull-request-comment) to find out more. 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=aiidalab). 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=aiidalab)

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