Python module has some python2 syntax needs to be updated to python3

[ekluzek]

Using the black formatter I noticed that the following file has python2 syntax and should be updated to python3 since python2 is no longer supported.

wkml/rgb2wkml.py

I think it's mostly the

print "thing"

type of statements need to change to

print( "thing)

So it's easy to do. You can check it with black and tell it what version you want to check it against.