Merge pull request #261 from AlbyIanna/AlbyIanna/fix-typo

fix typo in usage.md

Author: andreynering

docs/usage.md

@@ -63,7 +63,7 @@ tasks:
       - echo $GREETING
 ```
 
-> NOTE: `env` supports expansion and and retrieving output from a shell command
+> NOTE: `env` supports expansion and retrieving output from a shell command
 > just like variables, as you can see on the [Variables](#variables) section.
 
 ## Operating System specific tasks