validation instruction typo (#192)

Author: Gjergj

README.md

@@ -127,7 +127,7 @@ Example:
 	var xml = fs.readFileSync("signed.xml").toString()
 	var doc = new dom().parseFromString(xml)    
 
-	var signature = select(doc, "/*/*[local-name(.)='Signature' and namespace-uri(.)='http://www.w3.org/2000/09/xmldsig#']")[0]
+	var signature = select(doc, "//*[local-name(.)='Signature' and namespace-uri(.)='http://www.w3.org/2000/09/xmldsig#']")[0]
 	var sig = new SignedXml()
 	sig.keyInfoProvider = new FileKeyInfo("client_public.pem")
 	sig.loadSignature(signature)