Correct usage example in the README.md

[aik099]

The usage example in the README.md file is quite outdated:

• it has a Selenium\Client class import (likely from Selenium 1 driver), that doesn't exist in this driver
• it specifies the page URL in place of the WebDriver host URL
• no page is actually opened
• the Composer autoload.php file isn't included, which results in a Fatal error

The provided example might actually be working.

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 90.19%. Comparing base (4ca4083) to head (38dc757).

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #386 +/- ## ========================================= Coverage 90.19% 90.19% Complexity 168 168 ========================================= Files 1 1 Lines 469 469 ========================================= Hits 423 423 Misses 46 46 ```

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