Add createBbox to the named exports

[tordans]

I am curious, what does it do? / what does it mean? Suggestion: extend the changelog entry with this info.

[willemarcel]

@tordans I don't understand exactly why it happens, but some changesets fail to render on OSMCha because some functions from changeset-map and real-changesets-parser are not present in the production build, so we need to add it to the namedExports on the rollup config.

Thanks for the suggestion on documenting better the changelog!