update readme

README.md

@@ -4,19 +4,15 @@
 
 ```
 # install golang 1.9+
-
-
 cp config.example.ini config.ini
 # edit it for free
 sudo go run cmd/main.go --config=config.ini
-
-go build -o tun2socks
 ```
 
 ## Support operating system.
 
-* [x] macOS 10.13.1
-* [x] arch linux
+* [x] macOS
+* [x] linux
 * [x] windows 10 support with [tap-windows6](https://github.com/OpenVPN/tap-windows6)
 * [x] Raspberry Pi support
 * [x] android support with root
@@ -29,9 +25,7 @@ Support `route`, `udp.proxy`, `proxy`, `pattern` and `rule`, see [config.example
 sudo kill -s USR2 $PID
 ```
 
-NOTE: `go run` not support kill command signal, please build app with `go build -o tun2socks`.
-
-## Known bugs
+NOTE: `go run` not support kill command signal.
 
 ## TODO