chore(Authors): Update username (#1103)

My current GitHub username is carlwgeorge.  My previous usernames were carlgeorge and cgtx.

AUTHORS

@@ -39,7 +39,7 @@ listed below by date of first contribution:
 * Rahman Syed (rsyed83)
 * Max Brauer (mamachanko)
 * Jen Montes (jenmontes)
-* Carl George (cgtx)
+* Carl George (carlwgeorge)
 * Lahache Stéphane (steffgrez)
 * John Vrbanac (jmvrbanac)
 * Steve McMaster (mcmasterathl)
@@ -50,7 +50,6 @@ listed below by date of first contribution:
 * Christian Pedersen (chripede)
 * Harrison Pincket (hpincket)
 * Usman Ehtesham Gul (ueg1990)
-* Carl George (carlgeorge)
 * Adam Yala (adamyala)
 * Grigory Bakunov (bobuk)
 * Vincent Raiken (Freezerburn)