Use Android gradle plugin version 3.1.2.

build.gradle

@@ -23,7 +23,7 @@ buildscript {
     }
 
     dependencies {
-        classpath 'com.android.tools.build:gradle:3.1.1'
+        classpath 'com.android.tools.build:gradle:3.1.2'
         classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:${project.ext.dependencies['kotlin']}"
     }
 }