message: Add instructions installing airbrake-js in Vue 3 apps
diff: -# Usage with Vue.js
  +Usage with Vue.js
  +==================
  -You can start reporting errors from your Vue.js app by configuring an
  -[`errorHandler`](https://vuejs.org/v2/api/#errorHandler) that uses a
  -`Notifier` initialized with your `projectId` and `projectKey`.
  +### Vue 2
  +
  +You can start reporting errors from your Vue 2 app by configuring an
  +[`errorHandler`](https://vuejs.org/v2/api/#errorHandler) that uses a `Notifier`
  +initialized with your `projectId` and `projectKey`.
  ```js
  import { Notifier } from '@airbrake/browser';
  @@ -12,7 +15,7 @@ var airbrake = new Notifier({
  projectKey: 'FIXME'
  });
  -Vue.config.errorHandler = function (err, vm, info) {
  +Vue.config.errorHandler = function (err, _vm, info) {
  airbrake.notify({
  error: err,
  params: {info: info}
  @@ -20,5 +23,30 @@ Vue.config.errorHandler = function (err, vm, info) {
  }
  ```
  -For more information on Vue.js error handling, read the [`errorHandler`
  -documentation](https://vuejs.org/v2/api/#errorHandler).
  +### Vue 3
  +
  +You can start reporting errors from your Vue 3 app by configuring an
  +[`errorHandler`](https://v3.vuejs.org/api/application-config.html#errorhandler)
  +that uses a `Notifier` initialized with your `projectId` and `projectKey`.
  +
  +```js
  +import { createApp } from "vue";
  +import App from "./App.vue";
  +import { Notifier } from '@airbrake/browser';
  +
  +var airbrake = new Notifier({
  + projectId: 1,
  + projectKey: 'FIXME'
  +});
  +
  +let app = createApp(App);
  +
  +app.config.errorHandler = function (err, _vm, info) {
  + airbrake.notify({
  + error: err,
  + params: {info: info}
  + });
  +}
  +
  +app.mount("#app");
  +```
  