Method json_reverse_iterator

include/json/json.hpp:13475–13476

create reverse iterator from iterator

    /// create reverse iterator from iterator
    explicit json_reverse_iterator(const typename base_iterator::iterator_type& it) noexcept
        : base_iterator(it) {}

    /// create reverse iterator from base class
    explicit json_reverse_iterator(const base_iterator& it) noexcept : base_iterator(it) {}