canonicalize contributor names and addresses

diff --git a/.mailmap b/.mailmap
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--- /dev/null
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+# https://www.kernel.org/pub/software/scm/git/docs/git-shortlog.html#_mapping_authors
+Gerda Shank <gshank@cpan.org> <gerda.shank@gmail.com>
+Jesse Sheidlower <jester@panix.com> Jesse <jester@panix.com>
+Jonathan Yu <jawnsy@cpan.org> <frequency@cpan.org>
+Kennedy Clark <hkclark@gmail.com> hkclark <hkclark@gmail.com>
+Kennedy Clark <hkclark@gmail.com> <hkclark@cpan.org>
+Mateu X. Hunter <hunter@missoula.org> Mateu X Hunter <hunter@missoula.org>
+Rafael Kitover <rkitover@cpan.org> <rkitover@io.com>