CSE7766 Update Interval (#91)

Author: OttoWinter

esphomeyaml/components/sensor/cse7766.rst

@@ -47,6 +47,8 @@ Configuration variables:
   :ref:`Sensor <config-sensor>` and :ref:`MQTT Component <config-mqtt-component>`.
 - **voltage** (*Optional*): Use the voltage value of the sensor in V (RMS).
   All options from :ref:`Sensor <config-sensor>` and :ref:`MQTT Component <config-mqtt-component>`.
+- **update_interval** (*Optional*, :ref:`config-time`): The interval to check the
+  sensor. Defaults to ``15s``. See :ref:`sensor-default_filter`.
 - **uart_id** (*Optional*, :ref:`config-id`): Manually specify the ID of the :ref:`UART Component <uart>` if you want
   to use multiple UART buses.