MNT: Update .mailmap

Author: effigies

.mailmap

@@ -41,6 +41,7 @@ Christopher J. Markiewicz <effigies@gmail.com> Chris Markiewicz <effigies@gmail.
 Christopher J. Markiewicz <effigies@gmail.com> Christopher J. Johnson <effigies@gmail.com>
 Christopher J. Markiewicz <effigies@gmail.com> Christopher J. Markiewicz <effigies@bu.edu>
 Christopher J. Markiewicz <effigies@gmail.com> Christopher J. Markiewicz <markiewicz@stanford.edu>
+Christopher J. Markiewicz <effigies@gmail.com> Chris Markiewicz <markiewicz@stanford.edu>
 Cindee Madison <cindee@berkeley.edu> cindeem
 Cindee Madison <cindee@berkeley.edu> cindeem <>
 Colin Buchanan <colinrbuchanan@gmail.com> Colin Buchanan <cbuchanan@cray4.(none)>