add cedar benchmark test code and update go mod file

Author: vcaesar

cedar_bm_test.go

@@ -0,0 +1,19 @@
+package cedar
+
+import (
+	"testing"
+
+	"github.com/vcaesar/tt"
+)
+
+func init() {
+	loadTestData()
+}
+
+func BenchmarkPrefixMatch(t *testing.B) {
+	fn := func() {
+		cd.PrefixMatch([]byte("abcdefg"), 0)
+	}
+
+	tt.BM(t, fn)
+}

go.mod

@@ -1,3 +1,5 @@
 module github.com/go-ego/cedar
 
 go 1.13
+
+require github.com/vcaesar/tt v0.0.0-20191103173835-6896a351024b

go.sum

@@ -0,0 +1,2 @@
+github.com/vcaesar/tt v0.0.0-20191103173835-6896a351024b h1:psGhQitWSo4KBpLghvJPlhHxTJ8LQl1y0ekjSreqvu4=
+github.com/vcaesar/tt v0.0.0-20191103173835-6896a351024b/go.mod h1:GHPxQYhn+7OgKakRusH7KJ0M5MhywoeLb8Fcffs/Gtg=