Update authors list, use .mailmap file

Use a git standard .mailmap file for removing duplicates and choosing
which names to use for authors that used different display names on
different commits.

This means `git log` and `git show` naturally pick it up, as well
as summary commands like `git shortlog -s` and `git shortlog -sn`,
and various GUIs for Git.

I've also added -f to the sort command as it appeared to (mostly)
be sorted case-insensitively already. Without this option, running
the script resulted in all lowercase names being moved to the end
of the list (tried both macOS/BSD's default sort, and the one from
gnu-coreutils). I'm guessing the previous run was done on a machine
with a different implementation or override present that uses some
kind of hybrid by default.

.mailmap

@@ -0,0 +1,4 @@
+Adrian Heine <[email protected]>
+Alistair Braidwood <[email protected]>
+Forbes Lindesay <[email protected]>
+Rich Harris <[email protected]>

AUTHORS

@@ -41,7 +41,9 @@ Joel Kemp
 Johannes Herr
 John-David Dalton
 Jordan Gensler
+Jordan Harband
 Jordan Klassen
+Julian Wyzykowski
 Jürg Lehni
 Kai Cataldo
 keeyipchan
@@ -75,25 +77,26 @@ piotr
 PlNG
 Praveen N
 Prayag Verma
-ReadmeCritic
 r-e-d
+ReadmeCritic
 Renée Kooi
-Richard Gibson
 Rich Harris
+Richard Gibson
 Sebastian McKenzie
 Shahar Soel
 Sheel Bedi
 Simen Bekkhus
 susiwen
 susiwen8
 Teddy Katz
-Timothy Gu
 Tim van der Lippe
+Timothy Gu
 Tony Ross
 Toru Nagashima
 tuesmiddt
 Victor Homyakov
 Vladislav Tupikin
 Wexpo Lyu
 zsjforcn
+星灵
 龙腾道

bin/update_authors.sh

@@ -1,3 +1,3 @@
 echo "List of Acorn contributors. Updated before every release." > AUTHORS
 echo >> AUTHORS
-git log --format='%aN' | grep -v 'Adrian Heine né Lang' | grep -v abraidwood | grep -v Rich-Harris | grep -v ForbesLindesay | sort -u >> AUTHORS
+git log --format='%aN' | sort -uf >> AUTHORS