Update README.md

Author: mac999

README.md

@@ -9,8 +9,10 @@ The scan to model pipeline (SMP) is an open source tool that automatically gener
 - Pipeline config file support (refer to pipeline config section)
 
 ## Revision history
-- 0.1: draft version. basic functions supports. It's still in its early stages, but if you have the will, you can improve the parts that are lacking.
-
+It's still in its early stages, but if you have the will, you can improve the parts that are lacking.</br>
+- 0.1: draft version. basic functions supports.
+- 0.15: add pipeline stage architecture.
+   
 ## Examples
 ![Pipeline Overview](https://github.com/mac999/scan_to_model_pipeline/blob/main/scan_to_model_pipeline.gif)
 ![Pipeline Overview](https://github.com/mac999/scan_to_model_pipeline/blob/main/image1.PNG)