break!: merge Tokenizer::new_with_emitter into Tokenizer::new

The Tokenizer does not perform any state switching, since
proper state switching requires a feedback loop between
tokenization and DOM tree building. Using the Tokenizer
directly therefore is a bit of a pitfall, since you might
not expect it to e.g. tokenize `<script><b>` as:

    StartTag(StartTag { name: "script", .. })
    StartTag(StartTag { name: "b", .. })

Since we don't want to make walking into pitfalls
particularly easy, this commit changes the Tokenizer::new
method so that you have to specify the Emitter.
Since this makes new_with_emitter redundant it is removed.

1 files changed, 3 insertions, 2 deletions

diff --git a/README.md b/README.md
index 8305537..13d9cc2 100644
--- a/README.md
+++ b/README.md
@@ -8,12 +8,13 @@
 
 ```rust
 use std::fmt::Write;
-use html5tokenizer::{Tokenizer, Token};
+use html5tokenizer::{DefaultEmitter, Tokenizer, Token};
 
 let html = "<title   >hello world</title>";
+let emitter = DefaultEmitter::<_, ()>::default();
 let mut new_html = String::new();
 
-for token in Tokenizer::new(html).flatten() {
+for token in Tokenizer::new(html, emitter).flatten() {
     match token {
         Token::StartTag(tag) => {
             write!(new_html, "<{}>", tag.name).unwrap();