"go vet ." should be run in the package directory, not in subdirectories

I have a subdirectory named "examples" in https://github.com/stefantalpalaru/pool and the default Go linter runs "go vet ." in that subdir instead of the package dir, leading to false positives for "examples/web_crawler.go".

There are two ways to fix this:
- make sure you always run that command in the project dir
- replace "go vet ." with "go tool vet some_file.go" as described here: https://github.com/golang/go/issues/23916