swap to yargs for consistency with our other projects

Author: brandenrodgers

CONTRIBUTING.md

@@ -1,20 +1,24 @@
 # Contributing
-Anyone should feel free to fork/PR this. Open source for the win!
-Please make sure and explain your changes thoroughly, update version and changelog where needed.
 
-_Note_: HubL tags, functions, expression tests and filters are all pulled from the `cos-rendering/v1/hubldoc` api, so do not update any `snippets/auto-gen/...` json files manually. Run `npm run generate` to re-generate these JSON files when HubL changes occur. `snippets/man_gen/...` files are for any extra/helpful snippets used in HubL - these files are maintained manually.
+Anyone should feel free to fork/PR this. Open source for the win! Please make sure and explain your changes thoroughly, update version and changelog where needed.
+
+_Note_: HubL tags, functions, expression tests and filters are all pulled from the `cos-rendering/v1/hubldoc` api, so do not update any `snippets/auto-gen/...` json files manually. Run `yarn generate` to re-generate these JSON files when HubL changes occur. `snippets/man_gen/...` files are for any extra/helpful snippets used in HubL - these files are maintained manually.
 
 ### To run this extension locally:
+
 - `git clone` repo
-- Compile the extension with `npm run dev`
+- Install dependencies with `yarn install`
+- Compile the extension with `yarn dev`
 - Open this project in Visual Studio Code
 - Press `f5` to launch a new VSCode window with the extension installed
 - Press `CMD` + `R` to reload the window after having made any changes
 
 ### Debugging
+
 Debugging grammar scopes can be done line-by-line using the [VSCode scope inspector](https://code.visualstudio.com/api/language-extensions/syntax-highlight-guide#scope-inspector).
 
 ### Publishing
+
 _Note: In order to publish you'll need to be added as a user in the HubSpot Azure Devops organization_
 
 - Install the [vsce](https://github.com/microsoft/vscode-vsce) command line tool
@@ -24,6 +28,8 @@ _Note: In order to publish you'll need to be added as a user in the HubSpot Azur
 - Run `vsce publish minor`, which will increment the version number in `package.json` and publish the extension to the VS Code Marketplace
 
 ### VSCode Extension Links
+
 Configuration
- - [Contribution points](https://code.visualstudio.com/api/references/contribution-points)
- - [Activation events](https://code.visualstudio.com/api/references/activation-events)
+
+- [Contribution points](https://code.visualstudio.com/api/references/contribution-points)
+- [Activation events](https://code.visualstudio.com/api/references/activation-events)