Addressed code review changes

Author: sapessi

Cargo.lock

@@ -25,6 +25,5 @@ simple_logger = "^1"
 hyper-tls = "^0.3"
 simple-error = "^0.1"
 failure = "^0.1"
-failure_derive = "^0.1"
 rusoto_core = "^0.35"
-rusoto_dynamodb = "^0.35"
+rusoto_dynamodb = "^0.35"

lambda-runtime/Cargo.toml

@@ -1,13 +1,13 @@
 extern crate lambda_runtime as lambda;
 extern crate log;
 extern crate serde_derive;
-#[macro_use]
 extern crate simple_error;
 extern crate simple_logger;
 
 use lambda::{lambda, HandlerError};
 use log::error;
 use serde_derive::{Deserialize, Serialize};
+use simple_error::bail;
 use std::error::Error;
 
 #[derive(Deserialize)]

lambda-runtime/examples/basic.rs

@@ -1,10 +1,11 @@
+#![feature(custom_attribute)]
+extern crate failure;
 extern crate lambda_runtime as lambda;
 extern crate log;
 extern crate serde_derive;
 extern crate simple_logger;
-#[macro_use]
-extern crate failure;
 
+use failure::Fail;
 use lambda::{lambda, HandlerError};
 use log::error;
 use serde_derive::{Deserialize, Serialize};

lambda-runtime/examples/custom_error_failure.rs

@@ -7,15 +7,13 @@
 //! package must be called `bootstrap`.
 //!
 //! ```rust,no_run
-//! #[macro_use]
 //! extern crate serde_derive;
-//! #[macro_use]
 //! extern crate lambda_runtime;
-//! #[macro_use]
 //! extern crate simple_error;
 //!
-//! use lambda_runtime::HandlerError;
-//!
+//! use lambda_runtime::{HandlerError, lambda};
+//! use simple_error::bail;
+//! use serde_derive::{Serialize, Deserialize};
 //!
 //! #[derive(Deserialize, Clone)]
 //! struct CustomEvent {