WARNING: API 'variant.getAssemble()' is obsolete and has been replaced with 'variant.getAssembleProv

AndroidStudio3.4.1 编译项目时遇到以下警告（API过时）：

WARNING: API 'variant.getAssemble()' is obsolete and has been replaced with 'variant.getAssembleProvider()'.
It will be removed at the end of 2019.
For more information, see https://d.android.com/r/tools/task-configuration-avoidance.
To determine what is calling variant.getAssemble(), use -Pandroid.debug.obsoleteApi=true on the command line to display more information.
Affected Modules: app

当前版本：

• AS：3.4.1
• Kotlin：1.3.21
• Gradle：5.1.1
• Gradle Plugin:3.4.1

解决办法：
降低Gradle Plugin版本，改为3.2.1，可以消除警告。