Upgrade http dependency

[brookman]

Upgrade http dependency

[nukeolay]

@brookman you can use @RCSandberg version that now in pull requests.
Just add this to your pubspec.yaml:

  signalr_core:
    git:
      url: https://github.com/RCSandberg/signalr_core.git
      ref: feature/bump-dart-and-package-versions

[RCSandberg]

That PR will hopefully be merged not too far in the future. Until then I'll keep my version up as we require it as well.

The PR in this repo is however depending on another PR to be merged first (jamiewest/sse_channel#2) So when that is in I'll update the one here..

[nukeolay]

@RCSandberg yes, but as your PR depends on your own updated version of sse_channel, we thankfully can use your fork, while PR is not merged.
Thanks a lot!

[mamaly12]

Hi there,
Can you give us an update regarding the issue?

[jamiewest]

I updated the package, let me know if there are any issues. Please re-open an issue if the problem persists.