minor typo. use python3

skyglow.py

-#!/usr/bin/python2
+#!/usr/bin/python3
 
-#TODO cathch if no ola is installed
+#TODO catch if no ola is installed
 # Traceback (most recent call last):
 #   File "./skyglow.py", line 5, in <module>
 #     from ola.ClientWrapper import ClientWrapper