Update version numbers in Readmes (#564)

Author: atouchet

README.md

@@ -20,7 +20,7 @@ Add html5ever as a dependency in your [`Cargo.toml`](https://crates.io/) file:
 
 ```toml
 [dependencies]
-html5ever = "0.27"
+html5ever = "0.29"
 ```
 
 You should also take a look at [`examples/html2html.rs`], [`examples/print-rcdom.rs`], and the [API documentation][].

xml5ever/README.md

@@ -37,8 +37,8 @@ templates. XML5 tries to handle most common errors, in a manner similar to HTML5
 Add xml5ever as a dependency in your project manifest:
 
 ```toml
-    [dependencies]
-    xml5ever = "0.18"
+[dependencies]
+xml5ever = "0.20"
 ```
 
 # Getting started