Fix release date

pitbulk · web-flow · commit 9593164081a6 · 2018-04-11T15:30:29.000+02:00
diff --git a/lib/Saml2/version.json b/lib/Saml2/version.json
@@ -1,6 +1,6 @@
 {
     "php-saml": {
         "version": "2.13.0",
-        "released": "05/03/2017"
+        "released": "05/03/2018"
     }
 }
