Fix upload percentage calculation function

[michaellimair]

Fix for issue #30

[dylanjha]

Hi @michaellimair thanks so much for this 🙌 I'm very keen on getting this shipped.

It would be amazing to have some test coverage on this. On the surface here the changes look good, but the logic in there is a little difficult to reason about at first glance. We made significant improvements to the test ENV in #36

Do you think you might be able to take a stab at adding tests to this PR? (and bringing it up to date with upstream changes)?

[michaellimair]

#36

Hi Dylan! Sure, will be working on this. Should I rebase from master or just merge the master branch to my working branch?

P.S: Props to the package, we have been using it in production for my company and it really helps 👯

[dylanjha]

@michaellimair thanks! Whichever you prefer. Either way we will squash the final merge

[michaellimair]

Hi @dylanjha, I have made a test case to check the progress event and ensure it does not jump backwards.

You can have a look, thanks 😄

[enormousrodent]

Do we have an idea when this will be merged back in to the master branch?

[dylanjha]

@michaellimair wow, this looks great! 🙌🏼 🎉 Thank you for adding that extra test coverage.

@enormousrodent I'll work on getting a new release out in the next couple days!