message: removed credentials struct
diff: @@ -18,15 +18,6 @@ use error;
  use transport::Transport;
  use events::{Listener, EventStream, new_listener};
  -/// DB user's credentials.
  -#[derive(Clone, Debug)]
  -pub struct Credentials {
  - /// DB user's username
  - pub username: String,
  - /// DB user's password
  - pub password: String
  -}
  -
  /// CDRS driver structure that provides a basic functionality to work with DB including
  /// establishing new connection, getting supported options, preparing and executing CQL
  /// queries, using compression and other.
  