Missing changes from Episode #36 (Adding a custom navigation bar to DashCast Part 2)

Hi guys,

I've checked your last episode about code refactoring and it seems that someone forgot to push changes after episode 36 with color change animation.

BeaconPainter class has only 2 properties whereas should have 4 (missing beaconColor and endColor):

dashcast/lib/main.dart

Lines 138 to 141 in fbb8aa1

	class BeaconPainter extends CustomPainter {
	final double beaconRadius;
	final double maxBeaconRadius;
	BeaconPainter({this.beaconRadius, this.maxBeaconRadius});

As a reference: https://youtu.be/JPWtboReduA?t=3657

If you do not mind I can create a pull request with missing changes :-)

Have a great day!