[tokenizer] re-added the carriage return as whitespace
[tokenizer] re-added the carriage return as whitespace

fixes #62

apparently Google's gumbo-parser does behave this way:
https://github.com/google/gumbo-parser/blob/101726c50e172e45be6002c51b85
e45f27f0c2c6/src/tokenizer.c#L322

fb55/htmlparser2,fb55/htmlparser2