chore: move to Traefik organization.

Co-authored-by: jbdoumenjou <jb.doumenjou@gmail.com>

integration/basic_test.go

@@ -8,8 +8,8 @@ import (
 	"syscall"
 	"time"
 
-	"github.com/containous/traefik/integration/try"
 	"github.com/go-check/check"
+	"github.com/traefik/traefik/integration/try"
 	checker "github.com/vdemeester/shakers"
 )