Remove @ from yarn command

Author: edmofro

README.md

@@ -7,7 +7,7 @@ Utility to evaluate [BODMAS](https://en.wikipedia.org/wiki/Order_of_operations)
 **Note:** Since this is a private repository, you will need to authenticate your connection to GitHub, for example via [ssh](https://docs.github.com/en/github/authenticating-to-github/connecting-to-github-with-ssh).
 
 ```
-yarn add @beyondessential/arithmetic
+yarn add beyondessential/arithmetic
 ```
 
 ### Usage