unhandled exception
I am getting this error. 

```
input chars: 462515 705.75%
input tokens: 100740 1229.74%
tokens: 100740 1229.74%
chars: 462515 705.75%
compressed: 124640 798.16%
Traceback (most recent call last):
  File "shrinko8.py", line 210, in <module>
  File "shrinko8.py", line 195, in main
  File "pico_compress.py", line 25, in write_compressed_size
  File "pico_compress.py", line 463, in compress_code
  File "utils.py", line 983, in u16
struct.error: ushort format requires 0 <= number <= 0xffff
[4184] Failed to execute script 'shrinko8' due to unhandled exception!

```
As you can see there's a quite big input here. I moved from PICO8 to PICOLOVE and use shrinko8 to compile all the Lua/p8 scripts into one, minified .p8 file. If possible, I would like to get some more info on this error: on what's going on, if it is related to my source. 

And yes, a great tool, thx for creating it.