update mailmap for myself

Author: jyn514

.mailmap

@@ -299,10 +299,14 @@ Joseph T. Lyons <JosephTLyons@gmail.com> <JosephTLyons@users.noreply.github.com>
 Josh Cotton <jcotton42@outlook.com>
 Josh Driver <keeperofdakeys@gmail.com>
 Josh Holmer <jholmer.in@gmail.com>
-Joshua Nelson <jyn514@gmail.com> <joshua@yottadb.com>
 Julian Knodt <julianknodt@gmail.com>
 jumbatm <jumbatm@gmail.com> <30644300+jumbatm@users.noreply.github.com>
 Junyoung Cho <june0.cho@samsung.com>
+Jynn Nelson <github@jyn.dev> <jyn514@gmail.com>
+Jynn Nelson <github@jyn.dev> <joshua@yottadb.com>
+Jynn Nelson <github@jyn.dev> <jyn.nelson@redjack.com>
+Jynn Nelson <github@jyn.dev> <jnelson@cloudflare.com>
+Jynn Nelson <github@jyn.dev>
 Jyun-Yan You <jyyou.tw@gmail.com> <jyyou@cs.nctu.edu.tw>
 Kalita Alexey <kalita.alexey@outlook.com>
 Kampfkarren <boynedmaster@gmail.com>