：appcompat-v7: 28.0.0-rc02
：android支持：设计：28.0.0-rc01 -> 应该为，但实际上并没有 rc02.
错误：
app/build.gradle:74: Error: All com.android.support libraries must use the exact same version specification (mixing versions can lead to runtime crashes).
Found versions 28.0.0-rc02, 28.0.0-rc01. Examples include com.android.support:animated-vector-drawable:28.0.0-rc02 and com.android.support:cardview-v7:28.0.0-rc01 [GradleCompatible]