You can still override the track-level default template by adding a .meta/readme.go.tmpl for the exercise in question. This removes the stray newline at the end of the generated READMEs.
See https://github.com/exercism/docs/blob/fe38450da526a35368e98fdb2f83ca40f1298aee/contributing-to-language-tracks/README.md#adding-hints