remove unused code from vendor

vendor/github.com/bmizerany/assert/example/point.go

@@ -1,5 +0,0 @@
-package point
-
-type Point struct {
-	X, Y int
-}

vendor/github.com/bmizerany/assert/example/point_test.go

@@ -1,13 +0,0 @@
-package point
-
-import (
-	"testing"
-	"assert"
-)
-
-func TestAsserts(t *testing.T) {
-	p1 := Point{1, 1}
-	p2 := Point{2, 1}
-
-	assert.Equal(t, p1, p2)
-}