Re: [web-bluetooth] Make RSSI non optional

Shall we include this in our Windows notes? 

```diff
 * [Windows](https://crbug.com/507419): Requires Windows 8.1.
   * To discover devices the user hasn't yet manually paired, requires
 Windows 10.
+  * The Scanning API will require Windows 10.

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Received on Thursday, 13 October 2016 12:53:40 UTC