Remove duplicate from test samples

We don't need to check something twice, so change the duplicate to
another valid url.

Author: Enrico

tests/VerbalExpressions/PHPVerbalExpressions/VerbalExpressionsTest.php

@@ -22,7 +22,7 @@ public static function provideValidUrls()
             array('http://github.com'),
             array('http://www.github.com'),
             array('https://github.com'),
-            array('https://github.com'),
+            array('https://www.github.com'),
             array('https://github.com/blog'),
             array('https://foobar.github.com')
         );