Update docstring

photo_to_kml/photo_to_kml.py

@@ -4,7 +4,7 @@ This script takes a folder of images, and creates a placemark with a thumbnail
 of each image, based on the GPS coordinates in the EXIF tags.
 
 Usage:
-  photo_to_kml.py [-h] IMAGE_FOLDER
+  photo_to_kml [-h] IMAGE_FOLDER
 
 Positional arguments:
   IMAGE_FOLDER  name of input folder
@@ -15,7 +15,7 @@ Optional arguments:
 Examples:
 
 Create a kml for a folder of photos, named 'image_folder'.
-> python photo_to_kml.py image_folder
+> photo_to_kml image_folder
 
 """