Update Android maven plugin to 2.1

Author: nhaarman

mockito-kotlin/build.gradle

@@ -14,7 +14,7 @@ buildscript {
         classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlin_version"
         classpath "org.jetbrains.dokka:dokka-gradle-plugin:0.9.17"
         classpath "com.jfrog.bintray.gradle:gradle-bintray-plugin:1.8.4"
-        classpath "com.github.dcendents:android-maven-gradle-plugin:2.0"
+        classpath "com.github.dcendents:android-maven-gradle-plugin:2.1"
     }
 }