message: readme: send text message
diff: @@ -59,7 +59,13 @@ var airbrakeJs = require('airbrake-js');
  var airbrake = new airbrakeJs({projectId: 1, projectKey: 'abc'});
  ```
  -The simplest method is to report errors directly:
  +You can send a textual message to Airbrake:
  +
  +```js
  +airbrake.notify(`user id=${user_id} not found`);
  +```
  +
  +Or report catched errors directly:
  ```js
  try {
  