default cidv1 to base32

cid.go

@@ -368,7 +368,7 @@ func (c Cid) String() string {
 	case 0:
 		return c.Hash().B58String()
 	case 1:
-		mbstr, err := mbase.Encode(mbase.Base58BTC, c.Bytes())
+		mbstr, err := mbase.Encode(mbase.Base32, c.Bytes())
 		if err != nil {
 			panic("should not error with hardcoded mbase: " + err.Error())
 		}

cid_test.go

@@ -438,25 +438,25 @@ func TestHexDecode(t *testing.T) {
 		t.Fatal(err)
 	}
 
-	if c.String() != "zb2rhhFAEMepUBbGyP1k8tGfz7BSciKXP6GHuUeUsJBaK6cqG" {
+	if c.String() != "bafkreie5qrjvaw64n4tjm6hbnm7fnqvcssfed4whsjqxzslbd3jwhsk3mm" {
 		t.Fatal("hash value failed to round trip decoding from hex")
 	}
 }
 
 func ExampleDecode() {
-	encoded := "zb2rhhFAEMepUBbGyP1k8tGfz7BSciKXP6GHuUeUsJBaK6cqG"
+	encoded := "bafkreie5qrjvaw64n4tjm6hbnm7fnqvcssfed4whsjqxzslbd3jwhsk3mm"
 	c, err := Decode(encoded)
 	if err != nil {
 		fmt.Printf("Error: %s", err)
 		return
 	}
 
 	fmt.Println(c)
-	// Output: zb2rhhFAEMepUBbGyP1k8tGfz7BSciKXP6GHuUeUsJBaK6cqG
+	// Output: bafkreie5qrjvaw64n4tjm6hbnm7fnqvcssfed4whsjqxzslbd3jwhsk3mm
 }
 
 func TestFromJson(t *testing.T) {
-	cval := "zb2rhhFAEMepUBbGyP1k8tGfz7BSciKXP6GHuUeUsJBaK6cqG"
+	cval := "bafkreie5qrjvaw64n4tjm6hbnm7fnqvcssfed4whsjqxzslbd3jwhsk3mm"
 	jsoncid := []byte(`{"/":"` + cval + `"}`)
 	var c Cid
 	err := json.Unmarshal(jsoncid, &c)
@@ -470,7 +470,7 @@ func TestFromJson(t *testing.T) {
 }
 
 func TestJsonRoundTrip(t *testing.T) {
-	exp, err := Decode("zb2rhhFAEMepUBbGyP1k8tGfz7BSciKXP6GHuUeUsJBaK6cqG")
+	exp, err := Decode("bafkreie5qrjvaw64n4tjm6hbnm7fnqvcssfed4whsjqxzslbd3jwhsk3mm")
 	if err != nil {
 		t.Fatal(err)
 	}