Updated README.

README.md

@@ -3,8 +3,8 @@
 [![Build Status](https://travis-ci.com/SergioBenitez/rocket.svg?token=CVq3HTkPNimYtLm3RHCn&branch=master)](https://travis-ci.com/SergioBenitez/rocket)
 
 Rocket is a work-in-progress web framework for Rust (nightly) with a focus on
-ease-of-use, expressability, and speed. It currently does not work. But, when it
-does, the following will be the canonical "Hello, world!" example:
+ease-of-use, expressability, and speed. Here's an example of a complete Rocket
+application:
 
 ```rust
 #![feature(plugin)]
@@ -13,17 +13,22 @@ does, the following will be the canonical "Hello, world!" example:
 extern crate rocket;
 use rocket::Rocket;
 
-#[route(GET, path = "/hello/<name>/<age>")]
-fn hello(name: &str, age: i8) -> String {
+#[route(GET, path = "/<name>/<age>")]
+fn hello(name: &str, age: u8) -> String {
     format!("Hello, {} year old named {}!", age, name)
 }
 
 fn main() {
     let mut rocket = Rocket::new("localhost", 8000);
-    rocket.mount_and_launch("/", routes![hello]);
+    rocket.mount_and_launch("/hello", routes![hello]);
 }
 ```
 
+Visiting `localhost:8000/hello/John/58`, for example, will trigger the `hello`
+route resulting in the string `Hello, 58 year old named John!` being sent to the
+browser. If an `<age>` string was passed in that can't be parsed as a `u8`, the
+route won't get called, resulting in a 404 error.
+
 Rocket requires a nightly version of Rust as it makes heavy use of syntax
 extensions. This also means that the first two unwieldly lines in the Rust file
 above are required.
@@ -31,22 +36,21 @@ above are required.
 ## Building
 
 Try running the examples in the `examples/` folder. For instance, the following
-sequence of commands builds the `Hello, world!` example:
+sequence of commands builds and runs the `Hello, world!` example:
 
 ```
-cd examples/hello
-cargo build
+cd examples/hello_world
 cargo run
 ```
 
-Then visit `localhost:8000/hello/{some_name}`, replacing `{some_name}` with some
-name.
+Then visit `localhost:8000`. You should see `Hello, world!`.
 
 ### OS X
 
 Apple has stopped shipping `openssl` with OS X.11. As such, if your build fails
-compile, you'll need to install `openssl`, `cargo clean`, and then `cargo build`
-again. Here are some lightweight instructions:
+to compile with some `openssl` related errors, you'll need to install `openssl`,
+`cargo clean`, and then `cargo build` again. Here are some lightweight
+instructions:
 
 ```
 brew install openssl