fixed dependencies

vendor/gonum.org/v1/plot/vgall.go

@@ -0,0 +1,16 @@
+// Copyright ©2017 The Gonum Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+//go:build !minimal
+// +build !minimal
+
+package plot // import "gonum.org/v1/plot"
+
+import (
+	_ "gonum.org/v1/plot/vg/vgeps"
+	_ "gonum.org/v1/plot/vg/vgimg"
+	_ "gonum.org/v1/plot/vg/vgpdf"
+	_ "gonum.org/v1/plot/vg/vgsvg"
+	_ "gonum.org/v1/plot/vg/vgtex"
+)