Improve PrestaShop detection

In the latest versions of PrestaShop the powered by link looks like this: <a class="_blank" href="http://www.prestashop.com" target="_blank">PrestaShop</a>, so the current RegExp fails!

This one is more generic: /Powered by <a\s+[^>]+>PrestaShop/

share/apps.json

@@ -2076,7 +2076,7 @@
 			"website": "www.prestashop.com",
 			"cats": [ 6 ],
 			"meta": { "generator": "PrestaShop" },
-			"html": "Powered by <a href=\"[^>]+PrestaShop",
+			"html": "Powered by <a\\s+[^>]+>PrestaShop",
 			"implies": "PHP"
 		},
 		"Prototype": {