Update Mockito dependency to 2.1.0

Author: nhaarman

mockito-kotlin/build.gradle

@@ -20,7 +20,7 @@ repositories {
 dependencies {
   compile "org.jetbrains.kotlin:kotlin-stdlib:$kotlin_version"
   compile "org.jetbrains.kotlin:kotlin-reflect:$kotlin_version"
-  compile "org.mockito:mockito-core:2.1.0-RC.2"
+  compile "org.mockito:mockito-core:2.1.0"
 
   /* Tests */
   testCompile "junit:junit:4.12"