Remove Kotlin setup

Summary: We don't use it, so we shouldn't download it.

Reviewed By: jknoxville

Differential Revision: D9262618

fbshipit-source-id: 56aef9abc788cc75790e1f70da6cc2a513e5f18b

build.gradle

@@ -8,7 +8,6 @@ buildscript {
         classpath "com.jfrog.bintray.gradle:gradle-bintray-plugin:${GRADLE_BINTRAY_PLUGIN_VERSION}"
         classpath "com.github.dcendents:android-maven-gradle-plugin:${ANDROID_MAVEN_GRADLE_PLUGIN_VERSION}"
         classpath "com.github.ben-manes:gradle-versions-plugin:${GRADLE_VERSIONS_PLUGIN_VERSION}"
-        classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:${KOTLIN_VERSION}"
     }
 }
 

gradle.properties

@@ -11,9 +11,6 @@ POM_LICENSE_DIST=repo
 POM_DEVELOPER_ID=facebook
 POM_DEVELOPER_NAME=facebook
 
-# Kotlin
-KOTLIN_VERSION=1.2.50
-
 # Shared version numbers
 LITHO_VERSION=0.18.0