README: Enhance error msg (again)

Author: tuxuser

README.md

@@ -118,7 +118,8 @@ async def async_main():
             print(
                 f"""
                 Could not refresh tokens from {tokens_file}, err={e}\n
-                You might have to delete the tokens file if refresh token is expired
+                You might have to delete the tokens file and re-authenticate 
+                if refresh token is expired
             """
             )
             sys.exit(-1)

readme_example.py

@@ -57,7 +57,8 @@ async def async_main():
             print(
                 f"""
                 Could not refresh tokens from {tokens_file}, err={e}\n
-                You might have to delete the tokens file if refresh token is expired
+                You might have to delete the tokens file and re-authenticate 
+                if refresh token is expired
             """
             )
             sys.exit(-1)