homr doesn't work properly when images have capitalized extensions

[D-Vaillant]

I was having issues running homr on IMG_123.JPEG. This is probably solvable with a one-liner along the lines of:
return os.path.splitext(path)[0] + new_extension

homr/homr/main.py

Line 82 in eee9bd9

def replace_extension(path: str, new_extension: str) -> str:

I just renamed the files, because path of least resistance.