chore: update README to indicate pairing is required

[meadowsjared]

This PR just makes it clear in the instructions that the bulb(s) should be paired with the Hue Bridge when you attempt to free them from the Hue Bridge.

When I used this, I wasted a ton of time attempting to use it, but it wouldn't work until I made sure to pair my lights with the Hue Bridge before scanning for them. I'm hoping that a simple change to the README.markdown will make it easier on others.

Thanks for making this awesome tool! 🥂

[vanviegen]

I'm not really sure if that statement is accurate. The way I think/thought of it, is that either the bulb is part of some network (possibly coordinated by a Hue Bridge), in which case this tool should be able to forcibly eject it from the network, or the bulb isn't part of a network, in which case it should have no trouble joining a network.

So, if the above is not mistaken, it shouldn't make sense to first join a Hue Bridge, in order to then use this tool and then join the desired Zigbee network... ?

[meadowsjared]

While your statement is USUALLY true. I had some specific Hue Lux bulbs that I had deleted from the Hue app, yet they weren't available to pair with other Zigbee hubs. 🤦‍♂️ In fact, those same bulbs couldn't even re-pair with the Philips Hue Bridge easily. In order to get them rejoined to Hue, I had to pair them with Hue using their serial numbers.

Re-pairing the bulbs with Hue Bridge was the only way I could get those dang bulbs to work with Hue Theif and finally be free. I was hoping that adding this text would save others the trouble I had. However, I'm open to whatever you'd think would be best.