Use docs.rs badge, update version in README

Author: kyeah

README.md

@@ -1,4 +1,4 @@
-[![Travis](https://travis-ci.org/mongodb-labs/mongo-rust-driver-prototype.svg)](https://travis-ci.org/mongodb-labs/mongo-rust-driver-prototype) [![Crates.io](https://img.shields.io/crates/v/mongodb.svg)](https://crates.io/crates/mongodb) [![License](https://img.shields.io/badge/license-Apache%202.0-blue.svg)](LICENSE)
+[![Travis](https://travis-ci.org/mongodb-labs/mongo-rust-driver-prototype.svg)](https://travis-ci.org/mongodb-labs/mongo-rust-driver-prototype) [![Crates.io](https://img.shields.io/crates/v/mongodb.svg)](https://crates.io/crates/mongodb) [![docs.rs](https://docs.rs/mongodb/badge.svg)](https://docs.rs/mongodb) [![License](https://img.shields.io/badge/license-Apache%202.0-blue.svg)](LICENSE)
 
 MongoDB Rust Driver Prototype
 =============================
@@ -23,7 +23,7 @@ The 1.0 driver is available on crates.io. To use the MongoDB driver in your code
 ```
 [dependencies]
 bson = "0.3.1"
-mongodb = "0.1.7"
+mongodb = "0.1.8"
 ```
 
 Then, import the bson and driver libraries within your code.
@@ -74,8 +74,3 @@ fn main() {
     }
 }
 ```
-
-Documentation
--------------
-
-Documentation is built using Cargo. The latest documentation can be found [here](https://docs.rs/mongodb). Generated documentation using `cargo doc` can be found under the *target/doc/* folder.