Panic when reading unsupported files

[Joeboy]

Hi!

The first thing I tried (having not read the instructions properly) was opening a .xlsx file, which panicked at /src/main.rs:43:39 - "invalid utf-8 sequence". Would be nice to handle that a bit more gracefully.

v0.8.4 installed with Cargo.

[shshemi]

Hi,
Producing cleaner errors and output messages is already in the backlog. I planning for implementation before v1.0.0.

[mattly]

I'm getting a similar panic -- found more fields than defined in 'Schema' -- when attempting to open a file that has fewer fields on its first line than exist on subsequent lines

[shshemi]

Quite the same story...