message: gltfpack: Add version number to the output file
  We now output meshoptimizer version number since that allows us to more
  easily track down issues.
diff: @@ -2739,8 +2739,13 @@ bool process(cgltf_data* data, std::vector<Mesh>& meshes, const Settings& settin
  append(json_lights, "}");
  }
  + char version[32];
  + sprintf(version, "%d.%d", MESHOPTIMIZER_VERSION / 1000, (MESHOPTIMIZER_VERSION % 1000) / 10);
  +
  append(json, "\"asset\":{");
  - append(json, "\"version\":\"2.0\",\"generator\":\"gltfpack\"");
  + append(json, "\"version\":\"2.0\",\"generator\":\"gltfpack ");
  + append(json, version);
  + append(json, "\"");
  if (data->asset.extras.start_offset)
  {
  append(json, ",\"extras\":");
  