update lightd main.c, add lux sensor support and test ok

guowenxue

2021-01-28 a903b916f09419e7324a2352232e601acc598d67

 modules/python/sht20.py

old mode 100644
new mode 100755
@@ -1,4 +1,6 @@
#!/usr/bin/python
#-*- coding: utf-8 -*-

import fcntl
import time
import unittest