Update README.md

Author: Altrozero

README.md

@@ -35,4 +35,11 @@ Format Postcodes in a consistent way
 
 $formatted = Postcode::format('Sr51NA'); // SR51NA
 $formatted = Postcode::format('sR5 1NA'); // SR51NA
-```
+```
+
+Pull a postcode from an address string
+```php
+<?php
+
+$postcode = Postcode::findInString('1 Fake Street, Fake Vil, Fake Country, SR51NA');
+```