move Git::Wrapper object out to an attribute for future reuse
new "include_releaser" config option
dump distmeta on test failure
Dist-Zilla-Plugin-Git-Contributors-0.003

          - new 'include_releaser' option, for filtering the releaser user out
            of the contributor list after 'include_authors' has been applied
            (include_authors = 1, include_releaser = 0 recommended)