docs: Provide a better summary

Fixes #76

README.md

@@ -7,6 +7,10 @@
 ![License](https://img.shields.io/crates/l/assert_cmd.svg)
 [![Crates Status](https://img.shields.io/crates/v/assert_cmd.svg)](https://crates.io/crates/assert_cmd)
 
+`assert_cmd` aims to simplify the process for doing integration testing of CLIs, including:
+- Finding your crate's binary to test
+- Assert on the result of your program's run.
+
 ## Install
 
 Add to your `Cargo.toml`:
@@ -27,6 +31,8 @@ let mut cmd = Command::cargo_bin("bin_fixture").unwrap();
 cmd.assert().success();
 ```
 
+See the [docs](http://docs.rs/assert_cmd) for more.
+
 ## Relevant crates
 
 Other crates that might be useful in testing command line programs.

src/lib.rs

@@ -1,8 +1,8 @@
 //! **Assert [`Command`]** - Easy command initialization and assertions.
 //!
-//! `assert_cmd` includes support for:
-//! - Setting up your program-under-test.
-//! - Verifying your program-under-test.
+//! `assert_cmd` aims to simplify the process for doing integration testing of CLIs, including:
+//! - Finding your crate's binary to test
+//! - Assert on the result of your program's run.
 //!
 //! ```toml
 //! [dependencies]
@@ -21,6 +21,7 @@
 //! - `current_dir`
 //! - `env` / `envs` / `env_remove` / `env_clear`
 //! - `write_stdin` / `pipe_stdin`
+//! - `timeout`
 //!
 //! Validate a [`Command`]:
 //! - `ok` / `unwrap` / `unwrap_err`