title: Gradle can't resolve 'kotlin' plugin. Am I missing the correct maven repository?
body: <p><code>gradle tasks</code> fails telling me it can't find the plugin 'kotlin'. My <code>build.gradle</code> file starts with:</p>
  
  <pre><code>buildscript {
    ext.kotlin_version = '1.3.11'
    repositories {
      mavenLocal()
      mavenCentral()
      jcenter()
      maven { url "https://dl.bintray.com/kotlin/kotlin-dev/" }
      maven { url "http://central.maven.org/maven2/" }
    }
    dependencies {
      classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlin_version"
    }
  }
  
  plugins {
    id 'kotlin'
    id 'application'
  }
  </code></pre>
  
  <p>WRT maven repositories, I'm clearly just trying to redundantly add all the kitchen sinks I can find. I have tried none, and commenting out some. Which one am I missing?
  From the log:</p>
  
  <pre><code>12:55:04.419 [DEBUG] [org.gradle.launcher.daemon.server.exec.ReturnResult] Daemon is dispatching the build result: Failure[value=org.gradle.initialization.Repor
  tedException: org.gradle.internal.exceptions.LocationAwareException: Build file '/home/_/workspace/_/build.gradle' line: 18
  Plugin [id: 'kotlin'] was not found in any of the following sources:
  
  - Gradle Core Plugins (not a core plugin, please see https://docs.gradle.org/5.0/userguide/standard_plugins.html for available core plugins)
  - Plugin Repositories (plugin dependency must include a version number for this source)]
  </code></pre>
  
  <p>I have also tried version 1.3.10 because it matches what's listed in gradle version info:</p>
  
  <pre><code>------------------------------------------------------------
  Gradle 5.0
  ------------------------------------------------------------
  
  Build time:   2018-11-26 11:48:43 UTC
  Revision:     7fc6e5abf2fc5fe0824aec8a0f5462664dbcd987
  
  Kotlin DSL:   1.0.4
  Kotlin:       1.3.10
  Groovy:       2.5.4
  Ant:          Apache Ant(TM) version 1.9.13 compiled on July 10 2018
  JVM:          1.8.0_181 (Oracle Corporation 25.181-b13)
  OS:           Linux 4.19.6-200.fc28.x86_64 amd64
  </code></pre>