Check rendered README.md files are committed

[jaeltan]

During release there was an error in committing the rendered README.md files for both manytrade and manydata.

[jaeltan]

From GitHub actions for manytrade PR:

Run git add README.md
[main da21fce] Re-build README.md
Committer: runner runner@Mac-1638530423455.local
1 file changed, 16 insertions(+), 18 deletions(-)
error: src refspec master does not match any
error: failed to push some refs to 'https://github.com/globalgov/manytrade'
No changes to commit

[BBieri]

Note to self:

It's solved! Basically what happened was that the default {usethis} template has a commit message pushing the master branch and not the main branch we have. See this guide for more.