Add James Hall to contributors
After change ID I should have added myself as a contributor.
@@ -22,6 +22,7 @@ David Symonds <dsymonds@golang.org>
Filippo Valsorda <hi@filippo.io>
Glenn Lewis <gmlewis@google.com>
Ingo Oeser <nightlyone@googlemail.com>
+James Hall <james.hall@shopify.com>
Johan Euphrosine <proppy@google.com>
Jonathan Amsterdam <jba@google.com>
Kunpei Sakai <namusyaka@gmail.com>
