Use sys.argv instead of hardcoded filename

So you can it from the command line

json2kml.py

@@ -14,7 +14,12 @@
 import codecs
 import html
 
-inputFile = "Saved Places.json"
+try:
+    inputFile = sys.argv[1]
+except IndexError:
+    print("Usage: python json2kml.py filename.json")
+    exit(1)
+
 outputFile = f'{inputFile[:-5]} [json2kml.py].kml'
 
 # JSON Encoding is UTF-8. Change stdout to UTF-8 to prevent encoding error