add a LICENSE file, too

see https://rt.cpan.org/Ticket/Display.html?id=33334
fix day-of-the-year parsing

https://rt.cpan.org/Ticket/Display.html?id=88211
update changelog with changes so far
tweak changelog layout
note that gmtime and localtime are not useful methods

https://rt.cpan.org/Ticket/Display.html?id=66079
bump version