Update 'readme.md'

readme.md

@@ -15,11 +15,13 @@ xcode-select --install
 ```
 
 <p>After install Homebrew.</p>
+
 ```bash
 ruby -e "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/master/install)"
 ```
 
 <p>Run the following command once you’re done to ensure Homebrew is installed and working properly:</p>
+
 ```bash
 brew doctor
 ```