chore(contributing): remove missing test script reference

Author: arashsheyda

CONTRIBUTING.md

@@ -15,7 +15,6 @@ Please note that this project is released with a [Contributor Code of Conduct](C
 
 1. [Fork][fork] and clone the repository
 1. Configure and install the dependencies: `npm install`
-1. Make sure the tests pass on your machine: `npm run test`
 1. Make sure linter passes on your machine: `npm run lint`
 1. Create a new branch: `git checkout -b my-branch-name`
 1. Make your change, add tests, and make sure the tests and linter still pass