websocket, utf: u8 fixes

vlib/x/json2/encoder.v

@@ -9,7 +9,7 @@ import strings
 // Encoder encodes the an `Any` type into JSON representation.
 // It provides parameters in order to change the end result.
 pub struct Encoder {
-	newline              byte
+	newline              u8
 	newline_spaces_count int
 	escape_unicode       bool = true
 }