message: Update README.md
  Add better spacing for readability in readme
diff: @@ -47,12 +47,14 @@ to determine which fields are required for either request.
  let token = "TOKEN_FROM_CHECKOUT".parse().expect("token to be valid");
  let mut params = stripe::ChargeParams::default();
  +
  // NOTE: Stripe represents currency in the lowest denominations (e.g. cents)
  params.amount = Some(1095); // e.g. $10.95
  params.source = Some(stripe::PaymentSourceParams::Token(token));
  // Example: Override currency to be in Canadian Dollars
  params.currency = Some(stripe::Currency::CAD);
  +
  let charge = stripe::Charge::create(&client, params).unwrap();
  println!("{:?}", charge); // => Charge { id: "ch_12345", amount: 1095, .. }
  ```
  