vetted_github_login? should be a class method

Author: niuage

lib/open_sesame/member.rb

@@ -33,7 +33,7 @@ def self.member?(member_login)
       OpenSesame.logger.info e
     end
 
-    def vetted_github_login?(member_login)
+    def self.vetted_github_login?(member_login)
       OpenSesame.vetted_github_logins.include?(member_login)
     end