Update README.md (#2820)

Co-authored-by: Minjie Wang <wmjlyjemaine@gmail.com>
Co-authored-by: Jinjing Zhou <VoVAllen@users.noreply.github.com>

examples/pytorch/ogb_lsc/README.md

 # Baselines for OGB Large-Scale Challenge (LSC) at KDD Cup 2021
 
-We offer alternative download links for OGB datasets:
+**Please upgrade your OGB to 1.3.1 to enable faster downloads**:
 
 - [Node Classification with MAG240M](https://dgl-data.s3-accelerate.amazonaws.com/dataset/OGB-LSC/mag240m_kddcup2021.zip)
 - [Link Prediction with WikiKG90M](https://dgl-data.s3-accelerate.amazonaws.com/dataset/OGB-LSC/wikikg90m_kddcup2021.zip)