message: Update README.md
  Fix missing comma
diff: @@ -118,7 +118,7 @@ To encode, you need to allocate target buffers (preferably using the worst case
  ```c++
  std::vector<unsigned char> vbuf(meshopt_encodeVertexBufferBound(vertex_count, sizeof(Vertex)));
  -vbuf.resize(meshopt_encodeVertexBuffer(&vbuf[0], vbuf.size(), vertices, vertex_count sizeof(Vertex)));
  +vbuf.resize(meshopt_encodeVertexBuffer(&vbuf[0], vbuf.size(), vertices, vertex_count, sizeof(Vertex)));
  std::vector<unsigned char> ibuf(meshopt_encodeIndexBufferBound(index_count, vertex_count));
  ibuf.resize(meshopt_encodeIndexBuffer(&ibuf[0], ibuf.size(), indices, index_count));
  