Update README.md

Add minor text addition to function_name in order to trigger a new travis-ci build.

Author: mguntli

README.md

@@ -68,5 +68,5 @@ The `devices` array contains all the accessories. You can see the accessory obje
  - **type** - Type of the accessory. As of now, the plugin supports 3 types: `lightbulb`, `temperaturesensor` and `humiditysensor`.
  - **device_id** - Device ID of the Particle Device (Core, Photon or Electron). It is defined in accessory so that you can use different Particle Devices for different accessory.
  - **event_name** - The name of the event to listen for sensor value update. This is only valid if the accessory is a sensor (i.e. currently `temperaturesensor` or `humiditysensor`). The plugin listens for events published from a Particle Device (using `Particle.publish`). The device firmware should publish the sensor values as a raw number.
- - **function_name** - The name of the function that will be called when an action is triggered via HomeKit. If there is no function provided, the default `power` will be used. This is only valid if the accessory is an actor (i.e. `lightbulb` or `switchaccessory`).
+ - **function_name** - The name of the particle function that will be called when an action is triggered via HomeKit. If there is no function provided, the default `power` will be used. This is only valid if the accessory is an actor (i.e. `lightbulb` or `switchaccessory`).