Fixed errors in readme (intercom#167)

Author: michael-k

README.rst

@@ -350,7 +350,7 @@ Events
 
  intercom.events.create(
 event_name='invited-friend',
-created_at=time.mktime(),
+created_at=time.mktime(time.localtime()),
 email=user.email,
 metadata={
 'invitee_email': '[email protected]',
@@ -370,9 +370,9 @@ your behalf
  intercom.events.create(
 event_name="placed-order",
 email=current_user.email,
-created_at=1403001013
+created_at=1403001013,
 metadata={
-'order_date': time.mktime(),
+'order_date': time.mktime(time.localtime()),
 'stripe_invoice': 'inv_3434343434',
 'order_number':{
 'value': '3434-3434',