Update vendor file to fix #426

vendor/golang.org/x/net/html/token.go

@@ -296,8 +296,7 @@ func (z *Tokenizer) Buffered() []byte {
 // too many times in succession.
 func readAtLeastOneByte(r io.Reader, b []byte) (int, error) {
 	for i := 0; i < 100; i++ {
-		n, err := r.Read(b)
-		if n != 0 || err != nil {
+		if n, err := r.Read(b); n != 0 || err != nil {
 			return n, err
 		}
 	}