Environment set in config can be dropped if notice.Context is specified

[mmcdaris]

If you configure your client with an Environment then later specify a context for the notice, the environment can be dropped since the context is replaced.
This makes sense because environment is stored in the context as specified in the api docs.
Maybe the contexts could be merged together instead of the specified one overwriting the exising context?

For example this would probably overwrite the context and drop the environment each time an error is sent:

public void SendNotification(Exception ex)
{
  Sharpbrake.Client.AirbrakeConfig airbrakeConfig = new Sharpbrake.Client.AirbrakeConfig()
  {
    ProjectId = "5555",
    ProjectKey = "asdf1234jklj1234",
    Environment = "sandbox"
  };

  var notifier = new Sharpbrake.Client.AirbrakeNotifier(airbrakeConfig);
  var notice = notifier.BuildNotice(ex);

  notice.Context = new Sharpbrake.Client.Model.Context()
  {
    Avocados = "Yes, Please!",
  };

  notifier.NotifyAsync(notice);
}

[aholovko]

@mmcdaris Yeah, merging context makes sense. I will evaluate options and consider on the optimal solution here.