--- a/app.go	Sun Apr 30 22:22:12 2017 +0200
+++ b/app.go	Sun Apr 30 22:58:12 2017 +0200
@@ -8,10 +8,10 @@
 package madon
 
 import (
-	"errors"
 	"net/url"
 	"strings"
 
+	"github.com/pkg/errors"
 	"github.com/sendgrid/rest"
 )