updated contributing

Author: Sakuk3

CONTRIBUTING.md

@@ -16,7 +16,7 @@ In order to contribute to this project, follow a few easy steps:
 1. [Fork](https://help.github.com/en/github/getting-started-with-github/fork-a-repo) this repository and clone it on your machine
 2. Open the local repository with [Visual Studio Code](https://code.visualstudio.com) with the remote development feature enabled (install the [Remote Development extension](https://marketplace.visualstudio.com/items?itemName=ms-vscode-remote.vscode-remote-extensionpack))
 3. Create a branch `my-awesome-feature` and commit to it
-4. Run `npm run prepare` and verify that they complete without errors.
+4. Run npm run `pre-pull-request` and verify that they complete without errors.
 5. Push `my-awesome-feature` branch to GitHub and open a [pull request](https://help.github.com/en/github/collaborating-with-issues-and-pull-requests/about-pull-requests)
 6. Liked some of my work? Buy me a ☕ (or more likely 🍺)