Update README.md [Models number updated]

Author: ekramasif

README.md

@@ -1,6 +1,6 @@
 # Code Pretraining Models
 
-This repo contains code pretraining models in the CodeBERT series from Microsoft, including five models as of June 2023.
+This repo contains code pretraining models in the CodeBERT series from Microsoft, including six models as of June 2023.
 - CodeBERT (EMNLP 2020)
 - GraphCodeBERT (ICLR 2021)
 - UniXcoder (ACL 2022)