docs: update the eventwebhook sample data

Author: Sam Harrison

test/test_eventwebhook.py

@@ -7,14 +7,22 @@
 class UnitTests(unittest.TestCase):
     @classmethod
     def setUpClass(cls):
-        cls.PUBLIC_KEY = 'MFkwEwYHKoZIzj0CAQYIKoZIzj0DAQcDQgAEEDr2LjtURuePQzplybdC+u4CwrqDqBaWjcMMsTbhdbcwHBcepxo7yAQGhHPTnlvFYPAZFceEu/1FwCM/QmGUhA=='
-        cls.SIGNATURE = 'MEUCIQCtIHJeH93Y+qpYeWrySphQgpNGNr/U+UyUlBkU6n7RAwIgJTz2C+8a8xonZGi6BpSzoQsbVRamr2nlxFDWYNH2j/0='
-        cls.TIMESTAMP = '1588788367'
-        cls.PAYLOAD = json.dumps({
-            'event': 'test_event',
-            'category': 'example_payload',
-            'message_id': 'message_id',
-        }, sort_keys=True, separators=(',', ':'))
+        cls.PUBLIC_KEY = 'MFkwEwYHKoZIzj0CAQYIKoZIzj0DAQcDQgAE83T4O/n84iotIvIW4mdBgQ/7dAfSmpqIM8kF9mN1flpVKS3GRqe62gw+2fNNRaINXvVpiglSI8eNEc6wEA3F+g=='
+        cls.SIGNATURE = 'MEUCIGHQVtGj+Y3LkG9fLcxf3qfI10QysgDWmMOVmxG0u6ZUAiEAyBiXDWzM+uOe5W0JuG+luQAbPIqHh89M15TluLtEZtM='
+        cls.TIMESTAMP = '1600112502'
+        cls.PAYLOAD = json.dumps(
+            [
+                {
+                    'email': 'hello@world.com',
+                    'event': 'dropped',
+                    'reason': 'Bounced Address',
+                    'sg_event_id': 'ZHJvcC0xMDk5NDkxOS1MUnpYbF9OSFN0T0doUTRrb2ZTbV9BLTA',
+                    'sg_message_id': 'LRzXl_NHStOGhQ4kofSm_A.filterdrecv-p3mdw1-756b745b58-kmzbl-18-5F5FC76C-9.0',
+                    'smtp-id': '<LRzXl_NHStOGhQ4kofSm_A@ismtpd0039p1iad1.sendgrid.net>',
+                    'timestamp': 1600112492,
+                }
+            ], sort_keys=True, separators=(',', ':')
+        ) + '\r\n'  # Be sure to include the trailing carriage return and newline!
 
     def test_verify_valid_signature(self):
         ew = EventWebhook()