Update README version (#215)

Author: banyan

README.md

@@ -22,16 +22,16 @@ The driver is available on crates.io. To use the MongoDB driver in your code, ad
 
 ```
 [dependencies]
-bson = "0.7.0"
-mongodb = "0.2.6"
+bson = "0.7.1"
+mongodb = "0.2.9"
 ```
 
 Alternately, you can use the MongoDB driver with SSL support. To do this, you must have OpenSSL installed on your system. Then, enable the `ssl` feature for MongoDB in your Cargo.toml:
 
 ```
 [dependencies]
 ...
-mongodb = { version = "0.2.6", features = ["ssl"] }
+mongodb = { version = "0.2.9", features = ["ssl"] }
 ```
 
 Then, import the bson and driver libraries within your code.