Fix readme and add simple example (#7)

* Fix readme and add simple example

* Bump version on readme

README.md

@@ -5,22 +5,23 @@ Fort is proc macro attribute crate for Bastion.
 ## Usage
 ```toml
 [dependencies]
-fort = "0.2"
+fort = "0.3"
 bastion = "0.3.*"
 ```
 
 You can directly use fort to load work onto the root supervisor with:
 ```rust
 #[fort::root]
-fn main() {
+async fn main(_: BastionContext) -> Result<(), ()> {
     println!("Running in Bastion runtime!");
+    Ok(())
 }
 ```
 
 Make your program fault-tolerant with `fort`:
 ```rust
 #[fort::root]
-fn main() {
+async fn main(_: BastionContext) -> Result<(), ()> {
     loop {
         println!("Undying main!");
         panic!("Error")
@@ -30,9 +31,12 @@ fn main() {
 
 You want to spawn multiple process
 ```rust
-#[fort::root(redundancy = 3)]
-fn main() {
-    println!("Running in Bastion runtime!");
+#[fort::root(redundancy = 10)]
+async fn main(_: BastionContext) -> Result<(), ()> {
+    loop {
+        println!("Undying main!");
+        panic!("Error")
+    }
 }
 ```
 
@@ -43,13 +47,18 @@ use std::io::Write;
 use std::net::TcpListener;
 
 #[fort::root]
-fn main() {
+async fn main(_: BastionContext) -> Result<(), ()> {
     let listener = TcpListener::bind("127.0.0.1:2278").unwrap();
     println!("TCP server started at 127.0.0.1:2278");
     for stream in listener.incoming() {
-        let mut stream = stream.unwrap();
-        stream.write(b"Hello World\r\n").unwrap();
-        panic!("Fail here!");
+        thread::spawn(|| {
+            let mut stream = stream.unwrap();
+            stream.write_all(b"Hello World\r\n").unwrap();
+            panic!("Fail in thread!");
+        });
+        panic!("Fail in event loop");
     }
+
+    Ok(())
 }
 ```

examples/simple.rs

@@ -0,0 +1,7 @@
+use bastion::prelude::*;
+
+#[fort::root]
+async fn main(_: BastionContext) -> Result<(), ()> {
+    println!("Running in Bastion runtime!");
+    Ok(())
+}