Code of Conduct link in README needs to be full URL

[jennybc]

There's a new CRAN check that gets triggered by README links to files below .github/, such as the code of conduct.

Make sure usethis's tools replace this internal link with a full URL. Probably to the file on GitHub? The one I just did "by hand" links to the file in the pkgdown site, which is probably a nice solution, but that can't really be the default strategy.

[hadley]

Note that problem still applies even if the file is in the root directory because we .Rbuildignore them to solve a different R CMD check problem.

[jennybc]

I'm tagging this for Tidyverse-dev-day. Even if someone opts NOT to fix the logic / template in usethis, making PRs to fix READMEs in existing repos would still be great. Here's the sort of commit that's needed to fix this post hoc in the case of a package that has a pkgdown site:

77d49e4

[krlmlr]

If pkgdown exposed its configuration settings, usethis could query and adapt.