Adding version guard against HHVM 3.12.1 where KindOfPersistentString was introduced
Adding version guard against HHVM 3.12.1 where KindOfPersistentString was introduced

guilhermegeek/msgpack-hhvm,reeze/msgpack-hhvm,guilhermegeek/msgpack-hhvm,reeze/msgpack-hhvm