- fix expireDate in credential

Example/Pods/Local Podspecs/PNObject.podspec.json

@@ -1,6 +1,6 @@
 {
   "name": "PNObject",
-  "version": "2.4.1",
+  "version": "2.4.2",
   "summary": "PNObject is a simple replica of the more complex ParseObject",
   "homepage": "https://github.com/giuseppenucifora/PNObject",
   "license": {
@@ -12,7 +12,7 @@
   },
   "source": {
     "git": "https://github.com/giuseppenucifora/PNObject.git",
-    "tag": "2.4.1"
+    "tag": "2.4.2"
   },
   "platforms": {
     "ios": "8.0"