add sender email to example.env

Author: Gareth Redfern

.env.example

@@ -32,7 +32,7 @@ MAIL_PORT=1025
 MAIL_USERNAME=null
 MAIL_PASSWORD=null
 MAIL_ENCRYPTION=null
-MAIL_FROM_ADDRESS=null
+MAIL_FROM_ADDRESS=test@test.com
 MAIL_FROM_NAME="${APP_NAME}"
 
 AWS_ACCESS_KEY_ID=