func SetupLoggingForLevels(token, env string, levels []logrus.Level) {
	setupLogging(token, env, levels)
}
SetupLoggingForLevels works like SetupLogging, but allows you to
set the levels on which to trigger this hook.
package rollrus
import (
	"fmt"
	"github.com/rollbar/rollbar-go"
	"github.com/sirupsen/logrus"
)
var defaultTriggerLevels = []logrus.Level{
	logrus.ErrorLevel,
	logrus.FatalLevel,
	logrus.PanicLevel,
}
var wellKnownErrorFields = []string{
	logrus.ErrorKey, "err",
}
func NewHook(token string, env string, opts ...OptionFunc) *Hook {
	h := NewHookForLevels(token, env, defaultTriggerLevels)
	for _, o := range opts {
		o(h)
	}
	return h
}
func SetupLogging(token, env string) {
	setupLogging(token, env, defaultTriggerLevels)
}