chore: default covers all shells

Signed-off-by: Taylor Price <tayworm@gmail.com>

Author: drpebcak

.goreleaser.yml

@@ -55,7 +55,7 @@ brews:
   - description: "GPTScript CLI"
     install: |
       bin.install "gptscript"
-      generate_completions_from_executable(bin/"gptscript", "completion", shells: [:bash, :zsh, :fish])
+      generate_completions_from_executable(bin/"gptscript", "completion")
     homepage: "https://github.com/gptscript-ai/gptscript"
     skip_upload: false
     folder: "Formula"