C-c C-k with `phi-2.Q5_K_M.llamafile` prints "usage"

[Hi-Angel]

So, just testing plugin out, I downloaded the smallest model phi-2.Q5_K_M.llamafile. While running C-c C-k the model just inserts the "usage" text into the buffer.

To reproduce

1. Download and put to $PATH the phi-2.Q5_K_M.llamafile
2. Set the binary name (setq copilot-bin "phi-2.Q5_K_M.llamafile")
3. Open any file and press C-c C-k to invoke completion

Expected

Some text from copilot is inserted

Actual

A large paragraph of "usage" appears in the buffer.