Update README.md

Author: designerror

README.md

@@ -391,15 +391,15 @@ Autocompletion
 For macOS, or older Unix systems you need to update bash.
 
 ```bash
-brew install bash
-chsh
-brew install bash-completion
+$ brew install bash
+$ chsh
+$ brew install bash-completion
 ```
 
 Autocompletion can be enabled globally
 
 ```bash
-sudo activate-global-python-argcomplete
+$ sudo activate-global-python-argcomplete
 ```
 
 or locally