util: Fix brew-url

Author: danielbayley

util/brew-update

@@ -1,7 +1,8 @@
 #!/usr/bin/env ys-0
 
-releases-url =: 'https://github.com/yaml/yamlscript/releases'
-brew-url =: '[email protected]:yaml/homebrew-yamlscript'
+releases-url =: "https://github.com/yaml/yamlscript/releases"
+repo =: ENV.GITHUB_REPOSITORY_OWNER || 'yaml'
+brew-url =: "https://github.com/$repo/homebrew-yamlscript"
 
 defn main(version):
   check-version: version