fixed dependencies

vendor/gonum.org/v1/plot/doc.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.
+
+// Package plot provides an API for setting up plots, and primitives for
+// drawing on plots.
+//
+// Plot is the basic type for creating a plot, setting the title, axis
+// labels, legend, tick marks, etc.  Types implementing the Plotter
+// interface can draw to the data area of a plot using the primitives
+// made available by this package.  Some standard implementations
+// of the Plotter interface can be found in the
+// gonum.org/v1/plot/plotter package
+// which is documented here:
+// https://godoc.org/gonum.org/v1/plot/plotter
+package plot // import "gonum.org/v1/plot"