audit: don't use GitHub zip files.

Signed-off-by: Mike McQuaid <mike@mikemcquaid.com>

Library/Homebrew/cmd/audit.rb

@@ -265,6 +265,11 @@ class FormulaAuditor
     urls.select { |u| u =~ %r[https://.*/(?:tar|zip)ball/] && u !~ %r[\.git$] }.each do |u|
       problem "Use /archive/ URLs for GitHub tarballs (url is #{u})."
     end
+
+    # Don't use GitHub .zip files
+    urls.select { |u| u =~ %r[https://.*github.*/(archive|releases)/.*\.zip$] && u !~ %r[releases/download] }.each do |u|
+      problem "Use GitHub tarballs rather than zipballs (url is #{u})."
+    end
   end
 
   def audit_specs