[rubygems/rubygems] Make "bundler? update --bundler" behave identically

rubygems/rubygems@30dce3f87d

Author: x-yuri

lib/rubygems/bundler_version_finder.rb

@@ -21,7 +21,7 @@ def self.prioritize!(specs)
   end
 
   def self.bundle_update_bundler_version
-    return unless File.basename($0) == "bundle"
+    return unless ["bundle", "bundler"].include? File.basename($0)
     return unless "update".start_with?(ARGV.first || " ")
     bundler_version = nil
     update_index = nil