Update README.md

Changing model perplexity to the latest checkpoint

README.md

@@ -39,7 +39,7 @@ Use the code below to get started with the model.
 
 |    Model    | Fertility |   PPL  |
 |:-----------:|:---------:|:------:|
-|   ganga-1b  |    1.12   |  36.21 |
+|   ganga-1b  |    1.12   |  34.85 |
 | airavata-7b |    1.69   |  46.24 |
 |  pragna-1b  |    1.58   |  12.74 |
 |  bloom-1b1  |    1.27   |  33.39 |