Fix BrowserStack config

[taion]

After remix-run/history@b7152a4.

[taion]

Bleh, I might just disable BrowserStack for now until @mjackson can tell me how to do this correctly 😄

We're not directly accessing browser APIs anyway except via history, so it's sort of "good enough" that we have coverage via history.

[taion]

Huh, Coveralls decided that it should do something now. Weird.

[timdorr]

That's because you're running the tests locally, so it can collect the stats coveralls uses now.

We've got one brower API use now, but not significant enough to test this across a handful of browsers and have to maintain the versions of those browsers used in the suite. I'd say nuke them and rely on the basic browser versions on Travis.

[taion]

Gah it's busted on history too: https://travis-ci.org/ReactTraining/history/builds/144879254

The last commit sets us up to run on Firefox and Chrome on Travis. Seems okay.

Congrats BTW (:

[mjackson]

I've emailed BrowserStack to see if we can figure out what's going on. I'd rather keep the tests running on BrowserStack, but it has been pretty flaky lately...

[mjackson]

BrowserStack has renewed my subscription. They sponsor us, and the sponsorship had expired. I'm going to follow up w them so this hopefully doesn't happen again in a few years.

[taion]

Cool... I also got the Codecov status thing fixed. Their patch status is a neat surface-level check to filter out new code that doesn't have adequate test coverage. Might turn off Coveralls entirely.

Gonna merge since this is just a tooling chore to align with history.