Update README versions

Author: sfackler

README.md

@@ -1,15 +1,15 @@
 # Rust-Postgres
 A native PostgreSQL driver for Rust.
 
-Documentation is available at https://sfackler.github.io/rust-postgres/doc/v0.8.9/postgres
+Documentation is available at https://sfackler.github.io/rust-postgres/doc/v0.9.0/postgres
 
 [![Build Status](https://travis-ci.org/sfackler/rust-postgres.png?branch=master)](https://travis-ci.org/sfackler/rust-postgres) [![Latest Version](https://img.shields.io/crates/v/postgres.svg)](https://crates.io/crates/postgres)
 
 You can integrate Rust-Postgres into your project through the [releases on crates.io](https://crates.io/crates/postgres):
 ```toml
 # Cargo.toml
 [dependencies]
-postgres = "0.8"
+postgres = "0.9"
 ```
 
 ## Overview