message: Make model_converter py3 only.
diff: @@ -348,6 +348,7 @@ pybind_extension(
  copts = ["-fexceptions"],
  features = ["-use_header_modules"],
  module_name = "pywrap_model_converter",
  + srcs_version = "PY3ONLY",
  deps = [
  ":model_converter",
  "//tensorflow_lite_support/cc/port:statusor",
  