Improve gradle build script

[toliner]

First of all, I would like to thank you for making this project.This is exactly what I was looking for.
I've tried to make something similar to this, but I've failed many times.

At first, I read *.gradle files of this project and found the following problems:

• However the main code is Kotlin, build the build scripts are not Kotlin but Groovy.
• old style of applying plugin (apply plugin: "id" style) is used.
• deprecated dependency declaration compile is used.
• duplicated code of repositories{} block.

I thing Gradle Kotlin DSL is much better than Groovy, but there are still some problems, so I'd like to hear your thoughts on that.

The use of plugins{} block to apply plugin and implementation dependency declaration is strongly recommended, so these should be fixed.

I have nothing to say about code duplication. This may solved by moving to Gradle Kotlin DSL, because you can use extension function to RepositoryHandler.

P.S. I'm not good at writing English and use machine translation in several places.

[maxirosson]

Thanks for your feedback. I created some issues:

• Migrate all build.gradle to Kotlin DSL https://github.com/releaseshub/releases-hub-gradle-plugin/issues/74
• Support plugins DSL Support plugins DSL #56

I already switched from compile to implementation