Add Cc to common headers (#578)

Co-authored-by: Bryan Moffatt <bmoffatt@users.noreply.github.com>

Author: bbaayyy

events/ses.go

@@ -49,6 +49,7 @@ type SimpleEmailHeader struct {
 type SimpleEmailCommonHeaders struct {
 	From       []string `json:"from"`
 	To         []string `json:"to"`
+	Cc         []string `json:"cc,omitempty"`
 	ReturnPath string   `json:"returnPath"`
 	MessageID  string   `json:"messageId"`
 	Date       string   `json:"date"`

events/testdata/ses-sns-event.json

@@ -101,6 +101,10 @@
             "to": [
               "recipient@example.com"
             ],
+            "cc": [
+              "cc@example.com",
+              "cc2@example.com"
+            ],
             "messageId": "<61967230-7A45-4A9D-BEC9-87CBCF2211C9@example.com>",
             "subject": "Example subject"
           }