Command LED support?

[Nate-Wilkins]

Hi thanks for this library!

I'm trying to encode a DuckyScript file with LED_G commands and it appears that these LED commands aren't supported.

The DuckyScript looks like:

DELAY 1000
LED_G

When running it through the encoder this is the output:

[+] Reading Input file.
  [-] Encoding File
[!] Error on line 2: LED_G is not a valid command

I'm not even sure how to add that into this repository - not very familiar with the encoding process...

Thanks for the help!