MAINT list @paulgb's full name

Author: larsmans

.mailmap

@@ -66,6 +66,7 @@ Noel Dawe <[email protected]> <[email protected]>
 Olivier Grisel <[email protected]> <ogrisel@turingcarpet.(none)>
 Olivier Grisel <[email protected]> <[email protected]>
 Olivier Hervieu <[email protected]> <[email protected]>
+Paul Butler <[email protected]>
 Peter Prettenhofer <[email protected]>
 Robert Layton <[email protected]>
 Roman Sinayev <[email protected]>