Explicitly point to use python3

Change-Id: Ia2e4c11977cf2ed10958a0624344504ce54685e9
Signed-off-by: Vishwanatha Subbanna <vishwa@linux.vnet.ibm.com>
diff --git a/parse_led.py b/parse_led.py
index fdffb6a..a52a1ce 100755
--- a/parse_led.py
+++ b/parse_led.py
@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 import yaml
 import os
 import argparse