Added support for updating member enable_comment_notifications

refs https://github.com/TryGhost/Team/issues/1664

This makes it possible for members to update their comment notification preferences

ghost/members-api/lib/repositories/member.js

@@ -317,6 +317,7 @@ module.exports = class MemberRepository {
             'geolocation',
             'products',
             'newsletters',
+            'enable_comment_notifications',
             'last_seen_at'
         ]);