Update version numbers in Readmes (#594)

Signed-off-by: Alex Touchet <26315797+atouchet@users.noreply.github.com>

Author: atouchet

README.md

@@ -20,7 +20,7 @@ Add html5ever as a dependency in your [`Cargo.toml`](https://crates.io/) file:
 
 ```toml
 [dependencies]
-html5ever = "0.30"
+html5ever = "0.31"
 ```
 
 You should also take a look at [`examples/html2html.rs`], [`examples/print-rcdom.rs`], and the [API documentation][].

xml5ever/README.md

@@ -38,7 +38,7 @@ Add xml5ever as a dependency in your project manifest:
 
 ```toml
 [dependencies]
-xml5ever = "0.21"
+xml5ever = "0.22"
 ```
 
 # Getting started