Update post_operation.py

Author: shriram192

servicex_codegen/post_operation.py

@@ -93,7 +93,7 @@ def post(self):
                 # code gen transformer returns the default transformer image mentioned in
                 # the config file
                 transformer_image = os.environ.get('TRANSFORMER_SCIENCE_IMAGE')
-                print(transformer_image)
+                print('Transformer Image: ',transformer_image)
 
                 # MultipartEncoder library takes multiple types of data fields and merge
                 # them into a multipart mime data type