Add vendor dependencies as part git repo

vendor/github.com/go-test/deep/README.md

@@ -0,0 +1,51 @@
+# Deep Variable Equality for Humans
+
+[![Go Report Card](https://goreportcard.com/badge/github.com/go-test/deep)](https://goreportcard.com/report/github.com/go-test/deep) [![Build Status](https://app.travis-ci.com/go-test/deep.svg?branch=master)](https://app.travis-ci.com/go-test/deep) [![Coverage Status](https://coveralls.io/repos/github/go-test/deep/badge.svg?branch=master)](https://coveralls.io/github/go-test/deep?branch=master) [![GoDoc](https://godoc.org/github.com/go-test/deep?status.svg)](https://pkg.go.dev/github.com/go-test/deep)
+
+This package provides a single function: `deep.Equal`. It's like [reflect.DeepEqual](http://golang.org/pkg/reflect/#DeepEqual) but much friendlier to humans (or any sentient being) for two reason:
+
+* `deep.Equal` returns a list of differences
+* `deep.Equal` does not compare unexported fields (by default)
+
+`reflect.DeepEqual` is good (like all things Golang!), but it's a game of [Hunt the Wumpus](https://en.wikipedia.org/wiki/Hunt_the_Wumpus). For large maps, slices, and structs, finding the difference is difficult.
+
+`deep.Equal` doesn't play games with you, it lists the differences:
+
+```go
+package main_test
+
+import (
+	"testing"
+	"github.com/go-test/deep"
+)
+
+type T struct {
+	Name    string
+	Numbers []float64
+}
+
+func TestDeepEqual(t *testing.T) {
+	// Can you spot the difference?
+	t1 := T{
+		Name:    "Isabella",
+		Numbers: []float64{1.13459, 2.29343, 3.010100010},
+	}
+	t2 := T{
+		Name:    "Isabella",
+		Numbers: []float64{1.13459, 2.29843, 3.010100010},
+	}
+
+	if diff := deep.Equal(t1, t2); diff != nil {
+		t.Error(diff)
+	}
+}
+```
+
+
+```
+$ go test
+--- FAIL: TestDeepEqual (0.00s)
+        main_test.go:25: [Numbers.slice[1]: 2.29343 != 2.29843]
+```
+
+The difference is in `Numbers.slice[1]`: the two values aren't equal using Go `==`.