网上教程7.0大多数配置是这样compile ‘com.jakewharton:butterknife:7.0.1′ ，不知道他们用的Android Studio是多少版本，我用的3.0并没有成功，报错如下：
Error:Execution failed for task ‘:app:javaPreCompileDebug'.
Annotation processors must be explicitly declared now. The following dependencies on the compile classpath are found to contain annota
