use new header form in create template

lib/cask/cli/create.rb

@@ -18,9 +18,8 @@ class Cask::CLI::Create < Cask::CLI::Base
   end
 
   def self.template(cask_name);
-    cask_class = cask_name.split('-').map(&:capitalize).join
     <<-EOS.undent
-      class #{cask_class} < Cask
+      cask :v1 => '#{cask_name}' do
         version ''
         sha256 ''
 

test/cask/cli/create_test.rb

@@ -36,7 +36,7 @@ describe Cask::CLI::Create do
     Cask::CLI::Create.run('new-cask')
     template = File.read(Cask.path('new-cask'))
     template.must_equal <<-TEMPLATE.undent
-      class NewCask < Cask
+      cask :v1 => 'new-cask' do
         version ''
         sha256 ''