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The usage example in the README.md file is quite outdated: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

Codecov Report

All modified and coverable lines are covered by tests ✅

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

Additional details and impacted files

@@            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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