Update vendor/

vendor/github.com/philopon/go-toposort/README.md

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+go-toposort
+==
+[![Build Status](https://travis-ci.org/philopon/go-toposort.svg?branch=master)](https://travis-ci.org/philopon/go-toposort)
+[![GoDoc](https://godoc.org/github.com/philopon/go-toposort?status.svg)](https://godoc.org/github.com/philopon/go-toposort)
+
+deterministic topological sort implementation for golang
+
+Example
+--
+
+```.go
+package main
+
+import (
+	"fmt"
+
+	toposort "github.com/philopon/go-toposort"
+)
+
+func main() {
+	graph := toposort.NewGraph(8)
+	graph.AddNodes("2", "3", "5", "7", "8", "9", "10", "11")
+
+	graph.AddEdge("7", "8")
+	graph.AddEdge("7", "11")
+
+	graph.AddEdge("5", "11")
+
+	graph.AddEdge("3", "8")
+	graph.AddEdge("3", "10")
+
+	graph.AddEdge("11", "2")
+	graph.AddEdge("11", "9")
+	graph.AddEdge("11", "10")
+
+	graph.AddEdge("8", "9")
+
+	result, ok := graph.Toposort()
+	if !ok {
+		panic("cycle detected")
+	}
+
+	fmt.Println(result)
+}
+```
+
+```
+[3 5 7 8 11 2 9 10]
+```
+
+License
+--
+MIT