goreleaser: brews.tap -> brews.repository (#204)

brews.tap has been deprecated in favor of brews.repository.
Update the goreleaser configuration per
https://goreleaser.com/deprecations/#brewstap.

Author: abhinav

.goreleaser.yml

@@ -38,7 +38,7 @@ aurs:
       email: [email protected]
 
 brews:
-  - tap:
+  - repository:
       owner: abhinav
       name: homebrew-tap
       token: "{{ .Env.HOMEBREW_TAP_GITHUB_TOKEN }}"