Fix Andrew Allen's email to be the right one

PiperOrigin-RevId: 177357974
diff --git a/CONTRIBUTORS b/CONTRIBUTORS
index 891139e..5c23f73 100644
--- a/CONTRIBUTORS
+++ b/CONTRIBUTORS
@@ -9,7 +9,7 @@
 # Names should be added to this file as:
 #     Name <email address>
 
-Andrew Allen <achew22@gmail.com>
+Andrew Allen <me@andrewzallen.com>
 Alex Eagle <alexeagle@google.com>
 Bowen Ni <bowen1897@gmail.com>
 Daniel Muller <mrmeku@gmail.com>