Update file README.md

README.md

@@ -22,7 +22,7 @@ Use pip to install the latest stable version of python-gitlab
 
 To export groups recursively and import them one-by-one under correct name and path, this script helps users who want to migrate their entire group structure.
 
-<img src="./fig/Migration_structure.png" width="300" height="250">
+<img src="./fig/Migration_structure.png" width="500" height="500">
 
 Usage: migration_group_export_import.py