Fix rubocop comma offenses

Author: i7an

examples/email_template.rb

@@ -21,7 +21,7 @@
 client.send(
   from: { email: 'mailtrap@example.com', name: 'Mailtrap Test' },
   to: [
-    { email: 'your@email.com' },
+    { email: 'your@email.com' }
   ],
   template_uuid: '2f45b0aa-bbed-432f-95e4-e145e1965ba2',
   template_variables: {

examples/full.rb

@@ -64,5 +64,5 @@
     { email: 'your@email.com', name: 'Your name' }
   ],
   subject: 'You are awesome!',
-  text: 'Congrats for sending test email with Mailtrap!',
+  text: 'Congrats for sending test email with Mailtrap!'
 )