Upgrade wdio-mediawiki to v5, use ECMAScript modules

Rewrite all imports and exports to ESM syntax, and also clean up the
README a bit since the usage example needs to be updated anyway.

Also drop declared compatibility with older webdriverio versions, which
I think has basically been a lie already (since wdio-mediawiki isn’t
compatible with them).

Bug: T406844

Author: lucaswerkmeister

README.md

@@ -3,11 +3,15 @@ WebdriverIO plugin for testing a Wikibase repo.
 
 This module contains mostly pageobjects and pagesections to be used in selenium browser tests for Wikibase.
 Usage example:
-the file pageobjects/item.page.js contains the pageobject for the item spec file. In Wikibase/repo/selenium/specs/item.js it will have to be required as follows:  
-`const ItemPage = require( 'wdio-wikibase/pageobjects/item.page' );`
+the file pageobjects/item.page.js contains the pageobject for the item spec file. In `Wikibase/repo/tests/selenium/specs/item.js` it will have to be imported as follows:
+```js
+import ItemPage from 'wdio-wikibase/pageobjects/item.page.js';
+```
 
-This enables components from the pageobject to be used in the spec by calling Itempage. e.g.:
-`ItemPage.addStatementLink.click();`
+This enables components from the pageobject to be used in the spec by calling ItemPage. e.g.:
+```js
+ItemPage.addStatementLink.click();
+```
 
 To update or change the contents of this module, clone it locally and commit the changes. Once a new npm version will be released you can run an npm update on your Wikibase instance, after which your changes should be available to you locally.
 

index.js

@@ -1,5 +1 @@
-'use strict';
-
-module.exports = {
-	// no exports for now, directly import wdio-wikibase/... instead
-};
+// no exports for now, directly import wdio-wikibase/... instead