escape ; in query values too

lib/aws/s3.rb

@@ -40,6 +40,7 @@ module AWS
       escaped = escape_uri(path)
       escaped.gsub!(/=/, '%3D')
       escaped.gsub!(/&/, '%26')
+      escaped.gsub!(/;/, '%3B')
       escaped
     end
 

test/object_test.rb

@@ -75,7 +75,7 @@ class ObjectTest < Test::Unit::TestCase
 
     begin
       AWS::S3::Base.connections['AWS::S3::Base'] = conn
-      assert_match 'response-content-disposition=attachment;%20filename%3Dfoo.txt',
+      assert_match 'response-content-disposition=attachment%3B%20filename%3Dfoo.txt',
         @object.url(:query => {
         'response-content-disposition' => 'attachment; filename=foo.txt'})
     ensure