Bug#964518: nanoblogger: replace transitional bsdmainutils dependency

[zeha@debian.org]

Package: nanoblogger
Version: 3.4.2-8
Severity: important

Dear Maintainer,

your package currently Depends on bsdmainutils, which has become a transitional
package.

Please change the dependency to one of the replacement packages:

* bsdutils
* bsdextrautils
* calendar
* ncal
* vacation

Thanks,
Chris