Log Message:
(math/R-chron) Updated 2.3.53 to 2.3.56

2020-08-18  Kurt Hornik  <Kurt.Hornik@wu.ac.at>

        * DESCRIPTION: New version is 2.3-56.

        * R/zzz.R: Drop .onAttach().

        * R/y2k.R:
        * man/chron-internal.Rd:
        Changed the default cutoff when expanding a 2-digit year to a
        4-digit year from 30 to 69 (as for Date and POSIXct in base R.)

2020-02-02  Kurt Hornik  <Kurt.Hornik@wu.ac.at>

        * DESCRIPTION: New version is 2.3-55.

        * R/zzz.R (.onAttach): Add.

2019-08-13  Kurt Hornik  <Kurt.Hornik@wu.ac.at>

        * DESCRIPTION: New version is 2.3-54.

        * R/dates.R:
        Add as.dates().
        Suggestion by Gabor Grothendieck <ggrothendieck@gmail.com>.

2019-08-12  Kurt Hornik  <Kurt.Hornik@wu.ac.at>

        * NAMESPACE:
        * R/times.R:
        Add as.times().
        Suggestion by Gabor Grothendieck <ggrothendieck@gmail.com>.