output more error information in webhooks example

Author: richleland

Diff for: examples/unwrapped/get_webhooks.php

@@ -22,5 +22,7 @@
 
     echo 'Congrats! You got a list of all your webhooks from SparkPost!';
 } catch (\Exception $exception) {
-    echo $exception->getMessage();
+    echo $exception->getAPIMessage()."\n";
+    echo $exception->getAPICode()."\n";
+    echo $exception->getAPIDescription()."\n";
 }