Update 'README.md'

README.md

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 The base (abstract) classes for my PHPUnit testing scripts.
 
-## BrowserTest.php
+---
+
+### BrowserTest.php
 Set up the Selenium test using args from environment
 Take a screenshot on failed test
 
-## DomainRedirectTest.php
+---
+
+### DomainRedirectTest.php
 This will test all combinations of http/https/www/trailing slash, checking that they all redirect to the same destination URL.
 
-## UrlRedirectTest.php
+---
+
+### UrlRedirectTest.php
 This will check (using curl) that the source URL redirects to the destination URL