Merge pull request #44 from pupitetris/update-readme

README.md: added observation to enable ECP on Roku device.

README.md

@@ -6,6 +6,10 @@ Open source Roku remote. Turn your Android Device into a control center for your
 <a href="https://play.google.com/store/apps/details?id=wseemann.media.romote" target="_blank">
 <img src="https://play.google.com/intl/en_us/badges/images/generic/en-play-badge.png" alt="Get it on Google Play" height="90"/></a>
 
+If RoMote fails to detect your Roku device or send commands to it,
+make sure the **Control by mobile apps** setting in your Roku [is
+enabled](https://support.roku.com/article/217288467#section-2).
+
 Privacy
 -------