Deprecate ->new()

The new() method should be deprecated because:
- BooK already exists
- There can be only one instance of BooK
- BooK is old, not new
- BooK is not subclassable
- all current methods are class methods, not object methods so this will not affect existing code

The modified new() implementation would be:

    sub new {
        shift
    }

URL: https://rt.cpan.org/Ticket/Display.html?id=60761
Merge branch 'dzil'