Improved file upload feedback

[Scott Chamberlain]

Hello and happy Tuesday, 

I've just updated Unsub to have better messages when you run into problems uploading files. Before this change sometimes file uploads would fail and not given any message at all. The known cases have been fixed, but new ones will most likely happen as you can imagine with files that can contain anything :)

This should help you (and me) get to file upload resolutions faster!  

Let me know if you have any questions at sup...@unsub.org

Some example error messages include:

COUNTER file uploads: 

- A file encoding issue: 'utf-8' codec can't decode byte 0xfc in position 3524: invalid start byte (try fixing encoding issues, possibly saving file in a different format, and/or changing file encoding)

- An issue with the data type in the yop column: First error. Error reading column 'yop': Unrecognized integer format.

Title price file uploads: 

- Missing required columns: Required: ['issn', 'price'], Found: ['1052-5629', 'USD', '1', '972']

PTA file uploads:

- Date in incorrect format: Error reading column 'start_date': Date must contain a 4-digit year

github release notes: https://github.com/ourresearch/jump-api/releases/tag/v3.1

Cheers, Scott