Update documentation links to point to the latest version on docs.rs

Cargo.toml

@@ -4,7 +4,7 @@ version       = "0.7.0"
 authors       = ["Thijs Cadier <thijs@appsignal.com>"]
 description   = "Mongo Rust driver built on top of the Mongo C driver"
 readme        = "README.md"
-documentation = "http://thijsc.github.io/mongo-rust-driver/mongo_driver/"
+documentation = "https://docs.rs/mongo_driver/"
 repository    = "https://github.com/thijsc/mongo-rust-driver"
 keywords      = ["mongodb", "database"]
 license       = "MIT/Apache-2.0"

README.md

@@ -10,7 +10,7 @@ Bson encoding and decoding is handled by the [bson crate](https://github.com/zon
 
 The API should still be considered experimental, but I'm not expecting changes at the moment.
 
-[Documentation](https://docs.rs/mongo_driver/0.6.0/mongo_driver/)
+[Documentation](https://docs.rs/mongo_driver/)
 
 ## Compatibility