Bug#926714: gradle: New upstream version is available

[Yangfl]

Emmanuel Bourg <ebourg at apache.org> 于2019年4月9日周二 下午10:57写道：
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> Control: block -1 by 892842
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> Kotlin is required to upgrade Gradle, help is welcome.
>
> Emmanuel Bourg

What? Kotlin requires a new gradle before this!