Upgrade to LEM v4

Author: gcatanese

lib/adyen/services/legalEntityManagement.rb

@@ -16,7 +16,7 @@ module Adyen
   class LegalEntityManagement
     attr_accessor :service, :version
 
-    DEFAULT_VERSION = 3
+    DEFAULT_VERSION = 4
     def initialize(client, version = DEFAULT_VERSION)
       @service = 'LegalEntityManagement'
       @client = client