Update README.md + installation

README.md

@@ -14,12 +14,13 @@ Playground: [https://rustq.github.io/3body-lang/](https://rustq.github.io/3body-
 Base on [Writing An Interpreter In Go](https://interpreterbook.com/) and [Monkey rs](https://github.com/wadackel/rs-monkey-lang) and [Monkey Rust 2021 Edition](https://github.com/meloalright/Monkey-Rust-2021-Edition)
 
 
-## Installation in Rust toolchain
+## Installation
 
-`MacOS`
+Install 3body in MacOS using [rust toolchain](https://www.rust-lang.org/tools/install)
 
 ```shell
-$ brew tap rustq/3body-lang && brew install rustq/tap/three_body
+$ brew tap rustq/3body-lang
+$ brew install rustq/tap/three_body
 ```
 
 ```shell