- update to 1.456
  - fix some spurious "Date" headers in badly-written tests
  - fix a horrendous bug that would let you end up with:
    Content-Type: image/jpeg; charset="utf-8"
  - correct test expectations for Encodings 1.313
- simplify provides filter
- use one buildreq per line for readability
- add module version requirements from META.yml
- BR: perl(base)
- add runtime dependency on perl(Email::Simple::Creator) ≥ 1.4
- drop redundant buildreqs perl(Email::Date) and perl(IO::All)
- don't need to remove empty directories from buildroot
- use %{_fixperms} macro rather than our own chmod incantation
- use DESTDIR rather than PERL_INSTALL_ROOT
- don't use macros for commands
- drop %defattr, redundant since rpm 4.4
- make %files list more explicit