switch to using yarn

Use yarn which makes it consisten with the LSP

Author: gorkem

.vscode/tasks.json

@@ -9,7 +9,7 @@
       // the command is a shell script
       "type": "shell",
       // we run the custom npm script "compile" as defined in package.json
-      "command": "npm run compile --loglevel silent",
+      "command": "yarn run compile --loglevel silent",
       // show the output window only if unrecognized errors occur.
       "presentation": {
         "reveal": "silent"

CONTRIBUTING.md

@@ -46,7 +46,7 @@ All contributions are welcome!
             ├──── yaml-language-server/
   ```
 
-3. Run `npm install` in both directories to initialize `node_modules` dependencies.
+3. Run `yarn install` in both directories to initialize `node_modules` dependencies.
 
 4. In `vscode-yaml/src/extension.ts` set the `serverModule` variable to:
 
@@ -59,7 +59,7 @@ All contributions are welcome!
 5. In BOTH directories run:
 
    ```bash
-   npm run compile
+   yarn run compile
    ```
 
 6. To run the language server in VSCode, click `View -> Debug`, then from the drop down menu beside the green arrow select `Launch Extension (vscode-yaml)`, click the arrow, and a new VSCode window should load with the YAML LS running.