mailmap: fix "git shortlog -nse"

ctrueden · ctrueden · commit 992bf992dc56 · 2014-04-18T13:38:01.000-05:00
diff --git a/.mailmap b/.mailmap
@@ -0,0 +1,2 @@
+Johannes Schindelin <johannes.schindelin@gmx.de>
+Mark Hiner <hiner@wisc.edu> <hinerm@gmail.com>

Original file line number	Diff line number	Diff line change
`@@ -0,0 +1,2 @@`
	`1`	`+Johannes Schindelin <johannes.schindelin@gmx.de>`
	`2`	`+Mark Hiner <hiner@wisc.edu> <hinerm@gmail.com>`