old_contents: {
  	'repo_type' : 'git',
  	'rename_folder' : 'spirv-tools',
  	'url' : 'https://github.com/KhronosGroup/SPIRV-Tools.git',
  	'needs_make' : False,
  	'needs_make_install' : False,
  	'needs_configure' : False,
  	'recursive_git' : True,
  	'_info' : { 'version' : None, 'fancy_name' : 'SPIRV Tools' },
  }
new_contents: {
  	'repo_type' : 'git',
  	'rename_folder' : 'spirv-tools',
  	'url' : 'https://github.com/KhronosGroup/SPIRV-Tools.git',
  	'needs_make' : False,
  	'needs_make_install' : False,
  	'needs_configure' : False,
  	'recursive_git' : True,
  	'update_check' : { 'type' : 'git', },
  	'_info' : { 'version' : None, 'fancy_name' : 'SPIRV Tools' },
  }
subject: add update check