skip MYMETA files from MANIFEST

Manifest tests complaint otherwise and these files
never should be shipped to CPAN.
@Git should be after NextRelease

Because of Git::Commit and it is documented in
the plugin's docs.
replace dist::zilla's deprecated plugins
replace dzil's BumpVersionFromGit with Get::NextVersion

The former is deprecated
fix Changes file

0.52 release was never placed into Changes, copy date from CPAN.
Merge pull request #11 from ruz/releng-fixups

Prepare next release