MAINT: Add script to update mailmap

Author: mgxd

tools/update_mailmap.sh

@@ -0,0 +1,22 @@
+#!/bin/bash
+
+# usage -> bash update_mailmap.sh <previous-release>
+# by default, will use the latest tag
+
+set -ux
+
+ROOT=$( git rev-parse --show-toplevel )
+MAILMAP=$ROOT/.mailmap
+
+LAST=$(git describe --tags `git rev-list --tags --max-count=1`)
+RELEASE=${1:-$LAST}
+
+IFS=$'\n'
+for NAME in $(git shortlog -nse $RELEASE.. | cut -f2-); do
+    echo $NAME
+done
+
+# sort and write
+sort $MAILMAP > .tmpmailmap
+cp .tmpmailmap $MAILMAP
+rm .tmpmailmap