Clearer warning

python_scripts/add_trees_to_open_street_map/import_existing_trees.py

@@ -17,7 +17,7 @@ def get_existing_forest(shp_input):
                           source=Path(shp_input).name
                           )
         if not added:
-            print(f"Warning, tree seems to be too close to others! Is it a duplicate?\n\t{tree_row}")
+            print(f"WARNING! tree seems to be too close to others! Is it a duplicate?\n\t{tree_row}")
     return forest
 
 if __name__ == "__main__":