strip trailing spaces [ci skip]

test/json/json_parser_test.rb

@@ -222,7 +222,7 @@ class JSONParserTest < Test::Unit::TestCase
     assert_predicate parse('{}', :freeze => true), :frozen?
     assert_predicate parse('[]', :freeze => true), :frozen?
     assert_predicate parse('"foo"', :freeze => true), :frozen?
-    
+
     if string_deduplication_available?
       assert_same -'foo', parse('"foo"', :freeze => true)
       assert_same -'foo', parse('{"foo": 1}', :freeze => true).keys.first