message: Apply suggestions from code review
  Change `Str` to `S` to make it more obviously a type parameter.
diff: @@ -15,7 +15,7 @@ pub struct Client {
  }
  impl Client {
  - pub fn new<Str: Into<String>>(secret_key: Str) -> Client {
  + pub fn new<S: Into<String>>(secret_key: S) -> Client {
  let client = reqwest::r#async::Client::new();
  Client { client, secret_key: secret_key.into(), headers: Headers::default() }
  }
  @@ -34,7 +34,7 @@ impl Client {
  ///
  /// This is recommended if you are acting as only one Account for the lifetime of the client.
  /// Otherwise, prefer `client.with(Headers{stripe_account: "acct_ABC", ..})`.
  - pub fn set_stripe_account<Str: Into<String>>(&mut self, account_id: Str) {
  + pub fn set_stripe_account<S: Into<String>>(&mut self, account_id: S) {
  self.headers.stripe_account = Some(account_id.into());
  }
  