Add displayName to Organization

Author: yohfee

lib/mackerel/organization.rb

@@ -1,8 +1,9 @@
 module Mackerel
   class Organization
-    attr_accessor :name
+    attr_accessor :name, :displayName
     def initialize(args = {})
       @name               = args["name"]
+      @displayName        = args["displayName"]
     end
 
     def to_h

spec/mackerel/organization_spec.rb

@@ -25,6 +25,7 @@
     let(:organization) { 
       {
         "name" => "HogeH",
+        "displayName" => "Fuga",
       }
     }