Update contributors

Author: Mordil

.mailmap

@@ -2,3 +2,5 @@ Nathan Harris <nathan@mordil.info> <Mordil@users.noreply.github.com>
 Nathan Harris <nathan@mordil.info> <nathan.harris@globant.com>
 Nathan Harris <nathan@mordil.info> <2nd.lt.harris@gmail.com>
 Cory Benfield <lukasa@apple.com> <cory@lukasa.co.uk>
+Tanner Nelson <me@tanner.xyz> <tanner@vapor.codes>
+Tanner Nelson <me@tanner.xyz>

CONTRIBUTORS.txt

@@ -16,7 +16,7 @@ needs to be listed here.
 - George Barnett <gbarnett@apple.com>
 - Nathan Harris <nathan@mordil.info>
 - Ondrej Rafaj <ondrej.rafaj@gmail.com>
-- tanner0101 <me@tanner.xyz>
+- Tanner Nelson <me@tanner.xyz>
 
 **Updating this list**