update readme

Author: liugangcode

README.md

@@ -165,8 +165,8 @@ predictions = model.predict(smiles_list)
 | GREA                | [Graph Rationalization with Environment-based Augmentations. KDD 2022](https://dl.acm.org/doi/abs/10.1145/3534678.3539347) |
 | DIR                  | [Discovering Invariant Rationales for Graph Neural Networks. ICLR 2022](https://arxiv.org/abs/2201.12872) |
 | SSR                  | [SizeShiftReg: a Regularization Method for Improving Size-Generalization in Graph Neural Networks. NeurIPS 2022](https://arxiv.org/abs/2206.07096) |
-| IRM                  | [Invariant Risk Minimization](https://arxiv.org/abs/1907.02893) |
-| RPGNN                | [Relational Pooling for Graph Representations. ICLR 2019](https://arxiv.org/abs/1903.02541) |
+| IRM                  | [Invariant Risk Minimization (2019)](https://arxiv.org/abs/1907.02893) |
+| RPGNN                | [Relational Pooling for Graph Representations. ICML 2019](https://arxiv.org/abs/1903.02541) |
 | GNNs                 | [Graph Convolutional Networks. ICLR 2017](https://arxiv.org/abs/1609.02907) and [Graph Isomorphism Network. ICLR 2019](https://arxiv.org/abs/1810.00826) |
 | Transformer (SMILES) | [Transformer (Attention is All You Need. NeurIPS 2017)](https://arxiv.org/abs/1706.03762) based on SMILES strings |
 | LSTM (SMILES)        | [Long short-term memory (Neural Computation 1997)](https://ieeexplore.ieee.org/abstract/document/6795963) based on SMILES strings |