Log Message:
Update to 1.73
Update DEPENDS

Upstream changes:
1.73     2017-01-31

- The format_datetime now checks that the object it is given isa DateTime
  object. Implemented by Mohammad S Anwar. GitHub #17.

1.72     2017-01-24

- Require DateTime::Locale 1.05. This fixes some test failures seen on CPAN
  Testers. Also require DateTime::TimeZone 2.09 because you should really
  update this on a regular basis.

- Require Specio 0.33 to fix other test failures seen on CPAN (I hope).

1.71     2017-01-24

- By default, the word boundary checks added in 1.69 are now off. You can
  enable them by passing "strict => 1" to the constructor. This was \ 
reported
  as an issue by Toby Corkindale as GitHub #15.

- Switched from Params::Validate to Params::ValidationCompiler.