Mitama.Result version 1.1.1

Enhancements

• unwrap_or_default is now explicitly deleted if and only if std::is_default_constructible_v<T> || std::is_aggregate_v<T> is false.
• unwrap_or_else(O op) is now invokes op without a error value if and only if std::is_invocable_v<O, E> is false and std::is_invocable_v<O> is true.