fixes 400 bad request

[SyborgStudios]

Recently we were getting 400 from coveralls when sending our reports.
Turns out the implementation that writes the request’s body content manually does not work anymore.

We switched it for a way simpler implementation that works again.

[divinity666]

I guess the solution is even easier: just check #177
(sorry read this a bit too late...)

[afinetooth]

@SyborgStudios @divinity666 Thanks for the contributions, but this repo is no longer maintained.

There is a new fork of this community-created Coveralls Language Integration for Ruby/Rails that is maintained that we now recommend in its place: https://github.com/tagliala/coveralls-ruby-reborn

That said, our official recommendation is to migrate to one of our Official Integrations:

• Coveralls GitHub Action if you're using GitHub Actions for CI;
• Coveralls Orb for CircleCI if you're using CircleCI for CI; and
• Coveralls Universal Coverage Reporter (aka. "Coverage Reporter") if you're using any other CI service.

Apologies, we should really archive this repo and update the README to this effect. (I have submitted an internal ticket to do that.)