fixed dependencies

vendor/gonum.org/v1/gonum/mat/consts.go

@@ -0,0 +1,15 @@
+// Copyright ©2016 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 mat
+
+// TriKind represents the triangularity of the matrix.
+type TriKind bool
+
+const (
+	// Upper specifies an upper triangular matrix.
+	Upper TriKind = true
+	// Lower specifies a lower triangular matrix.
+	Lower TriKind = false
+)