code: public static Single<String> sendSms(String apikey, String text, String mobile) {
          Map<String, String> params = new HashMap<String, String>();
          params.put("apikey", apikey);
          params.put("text", text);
          params.put("mobile", mobile);
          return post(URI_SEND_SMS, params);
      }
docs: 智能匹配模版接口发短信
  
  @param apikey apikey
  @param text   　短信内容
  @param mobile 　接受的手机号
  @return json格式字符串