Fix "websocket" example's readme, and make binary names unique (#45)

Give each example binary a unique name.

This should allow running cargo run --bin in the root directory.

http-proxy/Cargo.toml

@@ -9,7 +9,7 @@ name = "proxy"
 path = "src/main.rs"
 
 [[bin]]
-name = "server"
+name = "proxy-example-server"
 path = "src/server.rs"
 
 [dependencies]

http-proxy/README.md

@@ -9,5 +9,5 @@ cargo run --bin proxy
 To start local backend server:
 
 ```sh
-cargo run --bin server
+cargo run --bin proxy-example-server
 ```