format code with gofumpt

gofumpt (https://github.com/mvdan/gofumpt) provides a supserset of `gofmt` / `go fmt`,
and addresses various formatting issues that linters may be checking for.

We can consider enabling the `gofumpt` linter to verify the formatting in CI, although
not every developer may have it installed, so for now this runs it once to get formatting
in shape.

Signed-off-by: Sebastiaan van Stijn <github@gone.nl>

notifications/sinks_test.go

@@ -3,13 +3,12 @@ package notifications
 import (
 	"reflect"
 	"sync"
+	"testing"
 	"time"
 
 	events "github.com/docker/go-events"
 
 	"github.com/sirupsen/logrus"
-
-	"testing"
 )
 
 func TestEventQueue(t *testing.T) {