cnpy does not support large numpy headers

[TinkerSteve]

Looking at the npy specification

https://numpy.org/devdocs/reference/generated/numpy.lib.format.html

it seems like npy file headers can be up to 65535 bytes long.

but cnpy assumes here

https://github.com/rogersce/cnpy/blob/master/cnpy.cpp#L105

that the header will fit a char array of size 256.

This causes trouble on my end, though easy to fix ..... Or amy Missing something here ?

Best Regards