Update Marshal.dump tags for Time

spec/tags/ruby/core/marshal/dump_tags.txt

@@ -1,11 +1,9 @@
-fails:Marshal.dump with a Time dumps the zone and the offset
 fails(travis):Marshal.dump with an Exception dumps the message for the exception
 fails:Marshal.dump with a Symbol dumps a binary encoded Symbol
 fails:Marshal.dump with an Exception dumps an empty Exception
 fails:Marshal.dump with an Exception contains the filename in the backtrace
 fails:Marshal.dump with an Object dumps an Object with a non-US-ASCII instance variable
 fails:Marshal.dump with an Exception dumps the cause for the exception
-fails:Marshal.dump with a Time dumps the zone, but not the offset if zone is UTC
 fails:Marshal.dump with an Exception dumps instance variables if they exist
 fails:Marshal.dump with a Symbol dumps multiple Symbols sharing the same encoding
 fails:Marshal.dump with an object responding to #_dump Core library classes with #_dump returning a String with instance variables indexes instance variables and then a Time object itself
@@ -19,4 +17,3 @@ fails:Marshal.dump with a Hash dumps a Hash with compare_by_identity
 fails:Marshal.dump with a Hash dumps a Hash subclass with compare_by_identity
 fails:Marshal.dump with an Object raises TypeError if an Object extends an anonymous module
 fails:Marshal.dump with a Time dumps a Time subclass with multibyte characters in name
-fails:Marshal.dump with a Time raises TypeError with an anonymous Time subclass