update the readme.md

README.md

@@ -28,6 +28,7 @@ This tool generates relationship information between satellites for the latency
    pip install sds-sat-latency --index-url https://gitlab.ssec.wisc.edu/api/v4/projects/2693/packages/pypi/simple
 
    ```
+   I add a pre-build environment py39env.zip in the gitlab repo
 ## Usage
 
 ### Generating Satellite Relationships