Update README.md

Author: bschaatsbergen

README.md

@@ -13,12 +13,13 @@ zns is a command-line utility for querying DNS records, displaying them in a hum
 
 ## Installing
 
+### Homebrew
 ```sh
 brew install zns
 ```
 
+### MacPorts
 ```
-# Via MacPorts
 sudo port install zns
 ```