Function tweetust::oauth::request_token

pub fn request_token<'a, CK, CS, CB>(consumer_key: CK,
                                     consumer_secret: CS,
                                     oauth_callback: CB)
                                     -> RequestTokenRequestBuilder<'a> where CK: Into<Cow<'a, str>>, CS: Into<Cow<'a, str>>, CB: Into<Cow<'a, str>>