Update Email_generic_phishing

<class 'yara.SyntaxError'>: unreferenced string "$

email/Email_generic_phishing

@@ -37,5 +37,6 @@ rule Email_Generic_Phishing : email
   condition:
     all of ($eml*) and
     any of ($greeting*) and
+    any of ($url*) and
     any of ($lie*)
 }