Fix Base64Bytes sql.Scanner (#307)

Author: S7evinK

base64.go

@@ -58,8 +58,7 @@ func (b64 *Base64Bytes) Scan(src interface{}) error {
 	case string:
 		return b64.Decode(v)
 	case []byte:
-		new := append(Base64Bytes{}, v...)
-		b64 = &new
+		*b64 = append(Base64Bytes{}, v...)
 		return nil
 	case RawJSON:
 		return b64.UnmarshalJSON(v)

base64_test.go

@@ -157,7 +157,7 @@ func TestScanBase64(t *testing.T) {
 
 	inputStr := "VGhpcyBpcyBhIHRlc3Qgc3RyaW5n"
 	inputJSON := RawJSON(`"` + inputStr + `"`)
-	inputBytes := []byte(inputStr)
+	inputBytes := []byte(expecting)
 	inputInt := 3
 
 	var b Base64Bytes