update readme

Author: travisjeffery

README.md

@@ -4,10 +4,20 @@ mocker for go.
 
 ## Install
 
+Go: 
+
 ``` sh
 $ go install github.com/travisjeffery/mocker/cmd/mocker
 ```
 
+Homebrew:
+
+``` sh
+$ brew install travisjeffery/homebrew-tap/mocker
+```
+
+[Download](https://github.com/travisjeffery/mocker/releases)
+
 ## Usage
 
 ``` sh