message: Update readme for v0.2.0
diff: -stripe-rust 0.1.1
  +stripe-rust 0.2.0
  =================
  Rust API bindings for the Stripe v1 HTTP API
  @@ -8,7 +8,7 @@ Put this in your `Cargo.toml`:
  ```toml
  [dependencies]
  -stripe-rust = "0.1.1"
  +stripe-rust = "0.2.0"
  ```
  And this in your crate root:
  