chore(readme): add homebrew install instructions

Author: dsully

README.md

@@ -10,10 +10,16 @@ Display Git commit history with [conventional commit](https://www.conventionalco
 
 ## Installation
 
+### Cargo
 ```bash
 cargo install --git https://github.com/dsully/devmoji-log
 ```
 
+### Homebrew
+```bash
+brew install dsully/tap/devmoji-log
+```
+
 ## Usage
 
 ```bash