all: fix signature of [Element.WriteByte]

The WriteByte is the method in that conform [io.ByteWriter].

1 files changed, 2 insertions, 1 deletions

diff --git a/element.go b/element.go
index 8cd311c..498524c 100644
--- a/element.go
+++ b/element.go
@@ -219,8 +219,9 @@ func (el *element) Write(b []byte) {
 	el.raw = append(el.raw, b...)
 }
 
-func (el *element) WriteByte(b byte) {
+func (el *element) WriteByte(b byte) error {
 	el.raw = append(el.raw, b)
+	return nil
 }
 
 func (el *element) WriteString(s string) {