Perform general repo maintenance (#37)

* Perform general repo maintenance

- Bump deps
- Add Prettier
- Add `flarum-tsconfig` for typings support

* Move webpack config to devDeps

* Use organisation Prettier

* Add setup for https://github.com/flarum/flarum-tsconfig/pull/2

extensions/suspend/js/src/admin/index.js

@@ -1,11 +1,12 @@
 import app from 'flarum/app';
 
 app.initializers.add('flarum-suspend', () => {
-  app.extensionData
-    .for('flarum-suspend')
-    .registerPermission({
+  app.extensionData.for('flarum-suspend').registerPermission(
+    {
       icon: 'fas fa-ban',
       label: app.translator.trans('flarum-suspend.admin.permissions.suspend_users_label'),
-      permission: 'user.suspend'
-    }, 'moderate');
+      permission: 'user.suspend',
+    },
+    'moderate'
+  );
 });