message: FIX: ITK 4.12.2 uses file README.txt
diff: @@ -330,7 +330,7 @@ get_filename_component( _itk_root "${_itk_root}" PATH )
  get_filename_component( _itk_root "${_itk_root}" PATH )
  set( _itk_doc_path "${_itk_root}/share/doc/ITK-${ITK_VERSION_MAJOR}.${ITK_VERSION_MINOR}" )
  -if(ITK_VERSION VERSION_LESS "4.12.2")
  +if(ITK_VERSION VERSION_LESS "4.12.3")
  set(_readme "README.txt")
  else()
  set(_readme "README.md")
  