Fixed kotlinter.

app/build.gradle

@@ -3,7 +3,7 @@ plugins {
     id 'kotlin-android'
     id 'kotlin-android-extensions'
     id 'kotlin-kapt'
-    id 'org.jmailen.kotlinter' version '2.1.1'
+    id 'org.jmailen.kotlinter'
     id 'com.github.ben-manes.versions' version '0.25.0'
     id 'io.gitlab.arturbosch.detekt' version '1.0.1'
 }

build.gradle

@@ -1,14 +1,16 @@
 // Top-level build file where you can add configuration options common to all sub-projects/modules.
 
 buildscript {
-    ext.kotlin_version = '1.3.41'
+    ext.kotlin_version = '1.3.50'
     repositories {
         jcenter()
         google()
+        maven { url = uri("https://plugins.gradle.org/m2/") }
     }
     dependencies {
         classpath 'com.android.tools.build:gradle:3.5.0'
         classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlin_version"
+        classpath 'org.jmailen.gradle:kotlinter-gradle:2.1.1'
 
         // NOTE: Do not place your application dependencies here; they belong
         // in the individual module build.gradle files