Update README.md (#2853)

Change the format of  README.md

examples/pytorch/rect/README.md

@@ -36,7 +36,7 @@ The performance results are are as follows:
 |    **Citeseer**     |     42.04     |  37.55  | **56.32**  |
 
 <center>Table 1：node classification results with the first three classes as "unseen"</center>
-
+<br/><br/>
 
 
 | **Datasets/Models** | **NodeFeats** | **GCN** | **RECT-L** |
@@ -45,3 +45,4 @@ The performance results are are as follows:
 |    **Citeseer**     |     42.04     |  45.69  | **61.85**  |
 
 <center>Table 2：node classification results with the last two classes as "unseen"</center>
+<br/>