[doc]: update README
## Breaking News !!
+PGL v1.2 2020.11.20
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+- The PGL team proposed a new **Uni**fied **M**essage **P**assing Model (UniMP), and achieved the State of the Art on three tasks on the OGB leaderboards. You can find the code [here](./ogb_examples/nodeproppred/unimp).
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+- The PGL team proposed a two-stage recall and ranking model based on **ERNIEsage**, and won the **first place** in the TextGraphs-2020 competition co-organized by COLING.
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+- The PGL team worked hard to develop a **open course of Graph Neural Network (GNN)**, which will help you getting started with Graph Neural Network in seven days. Details can be found [here](https://aistudio.baidu.com/aistudio/course/introduce/1956)
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PGL v1.1 2020.4.29
- You can find **ERNIESage**, a novel model for modeling text and graph structures, and its introduction [here](./examples/erniesage/).
