silverwind fc2d75f86d
Enable `unparam` linter ()
Enable [unparam](https://github.com/mvdan/unparam) linter.

Often I could not tell the intention why param is unused, so I put
`//nolint` for those cases like webhook request creation functions never
using `ctx`.

---------

Co-authored-by: Lunny Xiao <xiaolunwen@gmail.com>
Co-authored-by: delvh <dev.lh@web.de>
..
metadata.go Enable `unparam` linter ()
metadata_test.go Add CRAN package registry ()