Eureka ~> 4.0 support

[mtnbarreto]

@alldritt could you release a new version that supports Eureka ~>4.0 ?

[alldritt]

It should be good now. Just update your Podfile to use Eureka ~> 4.0.0 and update:

    pod 'Eureka', '~> 4.0.0'
    pod 'ColorPickerRow', :git => 'https://github.com/EurekaCommunity/ColorPickerRow'  
    pod 'UIColor_Hex_Swift'

However, I've updated the example application to use Eureka 4. You can see that in the Eureka4 branch. I'll merge that into master in the next few days.

[alldritt]

I've merged changes to the Example application supporting Eureka 4, Xcode 9 and Swift 4.