Describe how to test, lint, watch in readme

README.md

@@ -142,7 +142,7 @@ jsoneditor:
 - To automatically build when a source file has changed:
 
   ```
-  npm run watch
+  npm start
   ```
 
   This will update `./jsoneditor.js` and `./jsoneditor.css` in the dist folder
@@ -150,6 +150,21 @@ jsoneditor:
   an expensive operation.
 
 
+## Test
+
+Run unit tests:
+
+```
+npm test
+```
+
+Run code linting ([JavaScript Standard Style](https://standardjs.com/)):
+
+```
+npm run lint
+```
+
+
 ## Custom builds
 
 The source code of JSONEditor consists of CommonJS modules. JSONEditor can be bundled in a customized way using a module bundler like [browserify](http://browserify.org/) or [webpack](http://webpack.github.io/). First, install all dependencies of jsoneditor: