Unable to download maven artifacts

[chibicitiberiu]

Our project relies on native-platform-0.13. Today when I tried to build, I'm getting 404 errors when trying to build.
The "Using" section in the readme says to use this:

repositories {
    jcenter()
}

dependencies {
    compile "net.rubygrapefruit:native-platform:0.21"
}

But even if I change the version to 0.21 as shown in the readme, I'm getting Could not find net.rubygrapefruit:native-platform:0.21.